An enterprising college student built an air conditioner for under $30 with a fan, a garbage can of ice water and some tubing. An enterprising college student built an air conditio...Mazda B3000: 2007 mazda b3000, heater only blows cold air only, 2007 mazda b3000, heater only blows cold air only, a/c works fine, no water leaks, I replaced thermostat. Also in vent position only cold air comes out when you turn temperature control. …Feb 22, 2009 · As with many Tacoma PreRunner SR5 owners, my heater after 60K miles, and little use, only blows cold air. The coolant is at the appropriate level. The blower/fan works well, the vets all work well, the AC works well if activated but only stays on high. Learn why your furnace may blow cold air and how to troubleshoot and repair it yourself. Find out the common problems, such as fan settings, dirty filter, pilot light, flame sensor, condensate line …WHY FORD F150 F-150 HEATER BLOWS COLD COOL 2014 2013 2012 2011 2010 2009If you have Ford F-150 F150 and the heater blows cold and you want to see which fuse ...Usually, when your space heater is not blowing hot air, but cold air instead, it is a hardware failure. Somewhere in the electronics, something went wrong. Going through the different sections above hopefully helped you troubleshoot your space heater. If you are good at electronics, you can try most fixes yourself.The cost of fixing a car heater blowing cold air can vary depending on whether you choose to tackle the issue yourself or take your car to a mechanic. If you decide to DIY, the expense should not exceed a few hundred dollars. However, seeking professional help can lead to costs reaching up to $1,000 or even more, depending on factors such as …A blocked heater core can also result in your Jeep’s heater blowing cold air. The heater core is a small radiator-like component responsible for warming the air that enters the cabin. Over time, mineral deposits and debris can accumulate within the heater core, obstructing the proper flow of coolant and reducing its heating capacity.The first scenario is that your heater is actually producing heat and everything is working fine. Except the clogged air filter prevents the fan from blowing the hot air out. The air channel is blocked. The other scenario is that your space heater does not blow hot air, but cold air instead.An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. The fan switch is “on” and the thermostat setting …Jan 13, 2024 · Incorrect thermostat settings often result in heaters blowing cold air, especially if set to 'cool' or at a low temperature. Malfunctions such as dead batteries, sensor issues, or fuse problems also contribute to this issue, typically indicated by erratic heating or the heater not responding. Another possible cause of your space heater blowing cold air could be a broken thermostat. A thermostat controls the temperature your space heater generates. Essentially, a thermostat is a simple feedback loop. “A thermometer is something that measures the temperature; a thermostat is something that tries to maintain the …Feb 19, 2020 ... Why Is My Heating Blowing Cold Air? Here Are 10 Reasons · 1) Check the Thermostat Settings · 2) Reset the Furnace · 3) The Air Filter Needs to...Jul 5, 2023 · 2. Incorrect thermostat settings. A few thermostat issues can cause cold air to blow from the vents. First, the thermostat might be set to “cool” instead of “heat.”. This is a common mistake considering the heat pump provides heating and cooling, and the outdoor unit runs for both functions. An enterprising college student built an air conditioner for under $30 with a fan, a garbage can of ice water and some tubing. An enterprising college student built an air conditio...The car heater can blow cold air because of different reasons. Most commonly, the car heater blows cold air because of the following reasons: Inappropriate working or a bad thermostat. Broken blower motor resistor. Insufficient supply of the coolant. Coolant leak.Nov 13, 2013 ... The tech came back and said he just needed to adjust the new pressure switch. Apparently it was set such too tight and wouldn't stay closed even ...If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems. O/B and Y control your first stage heating for heat pump systems. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.)Jul 5, 2023 · 2. Incorrect thermostat settings. A few thermostat issues can cause cold air to blow from the vents. First, the thermostat might be set to “cool” instead of “heat.”. This is a common mistake considering the heat pump provides heating and cooling, and the outdoor unit runs for both functions. Jul 22, 2023 · Reason #2: The Air Filter Is Dirty. This is one of the most common reasons a gas furnace will blow cold air and won’t shut off. Air filters get dirty and have to be replaced or cleaned on a regular basis. Your furnace has a safety switch, called a high limit switch, that opens and turns the burner off to prevent overheating or heat exchanger ... If you have an older furnace, find the switch box. Check to see if the auto/manual switch is stuck; it should be in the “auto” position (the “manual” setting will make the blower run continuously). Pull off the cover; if the dial is showing an on-off range of 100-150 degrees, then adjust the lower pointer to below 100.Dec 1, 2023 · The issues with a car heating system are common and easy to diagnose and fix. The common reasons for car heaters blowing cold air include low engine coolant, broken heater flaps, bad thermostats, and air in the cooling systems. Defective heater controls and clogged heater cores can also be the culprit. Oct 20, 2023 · Heater blowing cold air. Now that the temps are falling, I am having issues with my climate control when in Auto. Recently, even though it was 35°-40° outside and the climate control was set to 74°, it blew cold air and the fresh air light was on. It did this for over 10 minutes. I kept raising the temperature, turned the Auto off then back ... sebasteeno. 682 posts · Joined 2011. #3 · Feb 9, 2012. Very common fault as mines suffering with the same problem as are many others are too. Fixing is possible but the dealers will charge £2K as its a dash out job. Other fixes have been attempted with varying degrees of success but one i like the sound of is to cut open the heater box in ...1. Low coolant level - the cause more than you'd think on cars without rear heat. 2. Bad thermostat. However, the rear hear heat puts a kink in the thinking. Sounds like the coolant isn't making it to the front heater core which could be a bad heater switch or circuit to open the flow to the heater core. You may check the coolant hose going ...Learn why your furnace may blow cold air and how to troubleshoot and repair it yourself. Find out the common problems, such as fan settings, dirty filter, pilot light, flame sensor, condensate line …The heater may stop working in GMC Yukon due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...To diagnose and fix the issue with your 6.7 Cummins heater blowing cold air, you should check for any of these common problems and take appropriate action, such as clearing clogs, topping up coolant levels, replacing the thermostat, or repairing the blower motor. Components of the Heating System Heater Core and Blend Door. The heater …whats up people !! Had a Problem with my Dodge Ram heat not getting hot. So this video i dig into the heater recirculation door and do a little hack to he...When summer heat and humidity hits for real, cold showers and box fans can only do so much. At some point you’ll need to actually cool the air in your house if you want to stay com...Your heater has to first collect and compress the air in your home, then heat it and expel the cold air. Heating systems work by heat exchange, which means that …WHY FORD F150 F-150 HEATER BLOWS COLD COOL 2014 2013 2012 2011 2010 2009If you have Ford F-150 F150 and the heater blows cold and you want to see which fuse ... Without the heating, the blower will just blow out cold air. You need to check if your gas pilot light has gone out. To check it, just locate the pilot and see if it won’t light or if it won’t stay lit. If this is the case, the cold air coming from a furnace is due to a faulty pilot light. Solution: Simple in theory. Just bought a used 2007 Chrysler 300, very very nice car. I noticed that when its hot outside the heater will blow out hot air even when the thermostat knob is off i have to turn on the AC to get it to stop blowing hot, but when its …Dec 18, 2012 · Run the engine until it reaches normal operation temperature. Select the FLOOR position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting. Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot. sebasteeno. 682 posts · Joined 2011. #3 · Feb 9, 2012. Very common fault as mines suffering with the same problem as are many others are too. Fixing is possible but the dealers will charge £2K as its a dash out job. Other fixes have been attempted with varying degrees of success but one i like the sound of is to cut open the heater box in ...Oct 14, 2016 · The two hoses going into the firewall are both very warm to hot to the touch. The temperature gauge rises to its normal spot half way up the scale. In addition, for what its worth, during summer only the driver vent blew cold air. I topped off the AC charge and it made the center vent only just a small bit cooler. Like. Nov 22, 2021 · 2. Malfunctioning or Improperly-Set Thermostat. Another common culprit behind a heating system blowing cold air is a malfunctioning or improperly-set thermostat. When evaluating your thermostat, first check to see if someone in your household hasn’t accidentally switched it to a cool setting. If your thermostat is set on heat and the fan is ... Here are reasons why your Goodman furnace may be blowing cold air instead of hot air: Dirty air filter. Incorrect thermostat setting. Water gathering around the furnace. Broken motor. Pilot light issues. Gas valve issues. Control panel issues. Leaky air …Heater defrost blowing cold air. Jump to Latest Follow ... The #1 cause of heating problems is actually air in the cooling system. More information on how to deal with HVAC issues can be found in this article I wrote. 2016 Ram 3.0 diesel 3.55 w/LSD, G2 tonneau, Line-X, Weathertech mats, Mag-Hytec differential cover, Nfab bars, CB radio, …A heater that blows cold air. Damaged Temperature Blend Door. The temperature blend door mixes the hot and cold air to give the right cabin temperature. Any damage to this door can cause severe heater control problems, such as: The heater blowing hot air when set to cold. The heater blowing cold air when set to hot. Inconsistent cabin temperature.To check whether the problem is with the Nest orientation settings or not do the following. 1)Put the thermostat on heat and raise the temperature a bit higher than the current room temperature. 2) Wait a few minutes and if cold air blows out of the vents. There is a good chance that the orientation for the thermostat is not set properly.Air pockets in the cooling system: Air trapped in the cooling system can interfere with the flow of warm coolant to the heater core and cause the heater to blow cold air. 6. Faulty blower motor: If the blower motor is not functioning properly, it may not blow enough air over the heater core to generate hot air.If your gas level is too low it will cause your furnace to blow cold air ... Be sure to check the pressure and gas level in your home propane tank. . Another ...Reason Four: The Unit Has Overheated. Your heater may blow cold air because it’s overheating, but this doesn’t mean that the unit is broken. When a furnace overheats, it causes the safety feature to shut the system off to prevent fires and carbon monoxide leaks. This means that your furnace is no longer heating, and your home is …Heater blowing cold air. Jump to Latest Follow 99K views 36 replies 14 participants last post by Jaybirdbronco Dec 23, 2017. W. wide body Discussion starter 255 posts · Joined 2011 Add to quote; Only show this user #1 · Dec 18, 2012. i've done some research on here regarding this issue ...Still feel a chill, even with the heater turned on? Here are five reasons why your house is cold. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All...If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems. O/B and Y control your first stage heating for heat pump systems. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.)Nov 10, 2023 · A truck heater blowing cold air could be due to several reasons, such as a malfunctioning thermostat, low coolant levels, air pockets in the cooling system, a faulty heater core, or a blocked heater valve. Professional inspection and troubleshooting are recommended to determine the specific cause and resolve the issue. Why is my truck’s heater […] 8 Reasons The Heater Is Blowing Cold Air. The Pilot Light Is Out Or Faulty. The Air Filter Is Dirty. Dirty Flame Sensor. Low Gas Pressure. Ducts Have Air Leaks. …Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary. This should bleed off the air bubble.The cost of a heater core flush can range from $50 to $100. Broken Heater Fan. If your Subaru car heater is blowing cold air and you can’t hear the fan blowing, there could be an issue with the heater fan. The fan is responsible for blowing air over the heater core and into the cabin. If it’s broken, it won’t be able to push hot air into ...The heater may stop working in Ford Escape due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...When the engine is warmed up I get only cool air coming from the vents (all locations). I have checked the following: The cable from the Hot/Cold controlling the valve is moving the white lever at the bottom of the heater assembly. The lower pipes from the thermostat and into the car are getting nice and hot to touch, the top pipe is just warm.Why Is Your Mercedes-Benz Car Heater Blowing Cold Air? · Low Coolant Level. One of the most common causes of a Mercedes-Benz car heater blowing cold air is a ...Feb 22, 2009 · As with many Tacoma PreRunner SR5 owners, my heater after 60K miles, and little use, only blows cold air. The coolant is at the appropriate level. The blower/fan works well, the vets all work well, the AC works well if activated but only stays on high. Clogged Air Filters. Another possible cause of your electric heater blowing cold air is clogged air filters. Air filters are designed to trap dust, debris, and other particles to prevent them from entering the heating system. Over time, these filters can become dirty and clogged, restricting airflow and reducing the efficiency of the heater.According to About.com, if your air conditioner keeps blowing fuses or tripping circuit breakers, it is because the appliance is trying to draw more current than the fuse or breake...A heater that blows cold air. Damaged Temperature Blend Door. The temperature blend door mixes the hot and cold air to give the right cabin temperature. Any damage to this door can cause severe heater control problems, such as: The heater blowing hot air when set to cold. The heater blowing cold air when set to hot. Inconsistent cabin temperature.Oct 20, 2023 · Heater blowing cold air. Now that the temps are falling, I am having issues with my climate control when in Auto. Recently, even though it was 35°-40° outside and the climate control was set to 74°, it blew cold air and the fresh air light was on. It did this for over 10 minutes. I kept raising the temperature, turned the Auto off then back ... The Fan Is On. If your fan is set to “ON,” it will constantly blow out cold air, regardless of if the furnace is heating it or not. You should check your thermostat and identity what it is set at. If it’s set to “ON,” switch it to “AUTO.”. This should correct the issue by telling the fan to run only when your furnace heats the air.December 3, 2020. If your furnace is blowing cold air in your home, this is a sign of an issue with the flame detector, gas supply, air filter, pilot light, or condensate lines. Many of these issues are able to be easily solved …1. Low coolant level - the cause more than you'd think on cars without rear heat. 2. Bad thermostat. However, the rear hear heat puts a kink in the thinking. Sounds like the coolant isn't making it to the front heater core which could be a bad heater switch or circuit to open the flow to the heater core. You may check the coolant hose going ... Possible Conclusion 3: Your Heat Pump Is in Defrost Mode. Defrosting is another reason your heat pump might blow cold air through your vents. When your heat pump goes into defrost mode, it switches into cooling mode, causing the outdoor coils to heat up to melt any frost or ice within the system. However, because the system is in cooling mode ... What you should do when your furnace is blowing cold air. Switch the thermostat setting. Check the control board diagnostic light. Change the air filter. Reset the high limit switch. Check the ignitor or pilot light. Clean the flame sensor. Check the gas supply and gas valve. Check the condensate drain and drain pan.Nov 8, 2012 · If the car is idling at all, (such as stopped and in park, stopped at a red light, etc.) the heater begins to blow cold air. It does this even when the temperature control is set all the way to hot, and doesn't matter if the defroster is on or the heating control is set to the vents. This occurs even when the engine is completely warmed up ... Possible Conclusion 3: Your Heat Pump Is in Defrost Mode. Defrosting is another reason your heat pump might blow cold air through your vents. When your heat pump goes into defrost mode, it switches into cooling mode, causing the outdoor coils to heat up to melt any frost or ice within the system. However, because the system is in cooling mode ... Oct 27, 2023 ... A clogged air filter can cause many problems—it can increase your furnace's energy consumption, reduce the efficiency of its heat exchanger and, ...If your furnace is blowing cold air, there is a possibility that the thermostat is sending the message to turn on the blower motor, but not the burner. Without activating the burners, the air being blown into your home will …Still feel a chill, even with the heater turned on? Here are five reasons why your house is cold. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All...The heater may stop working in VW Jetta due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...2. Incorrect thermostat settings. A few thermostat issues can cause cold air to blow from the vents. First, the thermostat might be set to “cool” instead of “heat.”. This is a common mistake considering the heat pump provides heating and cooling, and the outdoor unit runs for both functions.See full list on bobvila.com heater blows cold air A/C stopped working heater core engine complaint electrical issue heater complaint transmission complaint paint defect Rogue recall. The 2016 Nissan Rogue has 4 problems ...The heater may stop working in Ford Escape due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...Jan 10, 2022 · Check Furnace Air Filter. A second reason that your heater might be blowing cold air instead of warm air is due to a faulty furnace air filter. Furnaces fit with a clogged filter or dirty air filter can cause the heater to work overtime in order to compensate for the lack of indoor airflow and waste energy. To fix this issue, clean or replace ... Goldfish fish only appear to be blowing bubbles as it opens its mouth to draw in water for oxygen absorption. Sometimes as the fish opens its mouth, air escapes and creates a pocke...Feb 20, 2020 ... 1. How to test Pressure Switch! https://youtu.be/pDc8prsNgJY 2. Blows COLD "MOST COMMON CAUSES" https://youtu.be/tcZZC0KQOvM 3.Your heater may blow cold air because it’s overheating, but this doesn’t mean that the unit is broken. When a furnace overheats, it causes the safety feature to …Heater blowing cold air. I have a 1998 Renault Master 2.8 DTI and the heater is blowing cold air only, presumably because there is something wrong with the cooling system. The engine runs fine, the temperature gauge goes to 1/4 and sits there implying the engine is being cooled, but the water light is on (i presume the sensor has …WHY FORD F150 F-150 HEATER BLOWS COLD COOL 2014 2013 2012 2011 2010 2009If you have Ford F-150 F150 and the heater blows cold and you want to see which fuse ...Sep 10, 2021 · Car Heater Blowing Cold Due to Cooling System Issue. The four main cooling system problems that can cause a heater to blow cold air are: Stuck thermostat. Air in the cooling system. Plugged heater core. Coolant not flowing through the heater core. It's a little more complicated than that in practice, but these are the most common heater issues ... The first scenario is that your heater is actually producing heat and everything is working fine. Except the clogged air filter prevents the fan from blowing the hot air out. The air channel is blocked. The other scenario is that your space heater does not blow hot air, but cold air instead.Oct 20, 2023 · Heater blowing cold air. Now that the temps are falling, I am having issues with my climate control when in Auto. Recently, even though it was 35°-40° outside and the climate control was set to 74°, it blew cold air and the fresh air light was on. It did this for over 10 minutes. I kept raising the temperature, turned the Auto off then back ... Do you know how to make a solar water heater using a can? Find out how to make a solar water heater using a can in this article from HowStuffWorks. Advertisement You can harness th...8 Reasons The Heater Is Blowing Cold Air. The Pilot Light Is Out Or Faulty. The Air Filter Is Dirty. Dirty Flame Sensor. Low Gas Pressure. Ducts Have Air Leaks. …It’s difficult to accurately say the repair cost of a car heater blowing cold air because several factors can be the culprit. However, the repair cost can be as little as $10 or as high as $1000 or even more. A low coolant level is one of the common root causes and the easiest and cheapest to fix. If the low coolant level is the culprit, you’ll spend around …A lack of coolant and problems with the heater core are two of the most common causes of a heater blowing cold air. However, if you've checked these issues and ...
Do you know how to make a solar water heater using a can? Find out how to make a solar water heater using a can in this article from HowStuffWorks. Advertisement You can harness th.... Nba tv subscription
Here are reasons why your Goodman furnace may be blowing cold air instead of hot air: Dirty air filter. Incorrect thermostat setting. Water gathering around the furnace. Broken motor. Pilot light issues. Gas valve issues. Control panel issues. Leaky air …How to fix car heater blows cold air! no heat on passenger side watch Introducir 95+ imagen jeep wrangler heat not blowing hot Front vents not blowing heat/air. Heater Core Replacement Cost Jeep Wrangler / HVAC Heater Core fits 1984. Alana pannell Car heater blowing cold air Heater: the heater in our jeep only blows luke warm airMy car heater blows cold air. If your car heater is only blowing cold air, even when the engine is warm, there are a few potential causes. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. The ventilation fans blow air over the matrix and into the car. If it's …Aug 12, 2022 · 6.7 Cummins Heater Blowing Cold Air . If you own a 6.7 Cummins and your heater is blowing cold air, there are a few things that could be the culprit. First, check to see if the engine coolant level is low. If it is, add more coolant until it reaches the full line on the reservoir. Next, check the thermostat to see if it’s stuck in the closed ... 1) Blockage in the water hoses/pipes preventing hot radiator fluid from entering the cabin. I assume that the engine isn't overheating, so the water pump must be working. 2) Blocked/damaged ductwork. Flaps are activated to direct the flow of air past the heater core, which heats the air and is then blowin into the cabin.Mar 1, 2019 · Many heater issues do require professional assistance, but you may be able to pinpoint the issue yourself to assist the technician. Here are a few troubleshooting strategies that you can use the next time your heater seems to be blowing cold air. Give It a Few Minutes. When you turn on your faucet, hot water doesn’t immediately come out. 2. Incorrect thermostat settings. A few thermostat issues can cause cold air to blow from the vents. First, the thermostat might be set to “cool” instead of “heat.”. This is a common mistake considering the heat pump provides heating and cooling, and the outdoor unit runs for both functions.3. Check your thermostat. If you have ruled out number 1 and number 2 on the list, the next thing you want to consider is checking to see if you have a thermostat problem. For example, if you have your thermostat set on the ”on” position instead of “auto”, the furnace will continually run, even if it isn’t on the heat cycle,. In that ...The heater may stop working in Chevy Tahoe due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...Nov 8, 2018 ... 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air · 1) Dead Batteries in Thermostat · 2) Clogged Air Filter · 3) Interrupted Startup ....Feb 28, 2006 · 90. Lexus Model: 99 LS400, 04 LS430 Ultra. Posted February 28, 2006. I think i may have my first problem at 135,000 miles. The heater is blowing cold air even when the car is completely warmed up. Before this problem, i would set the climate control at 72 degrees at start up and the hot air would start coming out the vents in small increments ... Help. Heater blowing cold air. 2018 F150 V8. With 89k miles factor coolant is a little discolored but extremely clean. last month I posted about my random coolant leak now that it’s getting colder I tried running the heater fan works. Blender doors work. But no heat blows cool air. So I check the hot/cold blender turns fine.2. Incorrect thermostat settings. A few thermostat issues can cause cold air to blow from the vents. First, the thermostat might be set to “cool” instead of “heat.”. This is a common mistake considering the heat pump provides heating and cooling, and the outdoor unit runs for both functions.Nov 28, 2020 · And yes a bad temperature sensor can cause this. Low coolant, bad heater core, bad temp sensor, bad thermostat and air in the system. Make sure you have coolant flow throughout the system. The radiator uses the outside air, fan and coolant to cool the system and the heater core uses the heat to warm it. Dec 28, 2020. Usually, when your space heater is not blowing hot air, but cold air instead, it is a hardware failure. Somewhere in the electronics, something went wrong. Going through the different sections above hopefully helped you troubleshoot your space heater. If you are good at electronics, you can try most fixes yourself.Oct 13, 2022 · For example, with a natural gas furnace an issue with the supply line can cause the pilot light to keep going out. A propane furnace or oil furnace blowing cold air might indicate a low or empty fuel supply. And, a clogged oil filter can also cause an oil furnace to turn on and blow cold air. Front vent is also blowing cold air and this is very dangerous during winter season. Nissan fixed it twice for free but the problem comes back after a day. Now they are charging me $1500 to repair ...The most common cause of a Dodge Ram heater blowing cold air is a clogged heater core. A clogged heater core can reduce the flow of hot coolant, causing cold air to be blown from the vents. Other causes include low coolant levels, a failing thermostat, or a damaged blower motor. The Dodge Ram heater blowing cold air is a common …Dec 29, 2016 · GTyankee. 32816 posts · Joined 2009. #4 · Dec 29, 2016 (Edited) there is a chance that the heater core is blocked. one way to tell is to set your heater to all the high settings & drive a few miles. Then find the 2 heater hoses under the hood, both hoses should be hot or at least fairly warm. I have a 2019 Passenger 144 4x4 with 9,500 mile...and turned on the heat for the first time (55 degrees-- south TX you know...) On full AUTO, it was blowing cold air up front but the rear floor heater was blowing hot..