Here’s another possible DIY fix for your heater blowing cold air. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. Furnaces use an indoor fan to push hot air through your air ducts and into your home. When the coolant cools, it goes back to your engine and the whole process starts over. Repeated overheating will hurt the furnace’s heat exchanger, which is expensive to fix. Change the setting back to AUTO, and you’ll have heat again. They both blow cold air when the temperature gets to where you set your preferred at. Check the Pilot Light on Gas Furnaces. Another common problem is when air gets into the cooling system. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. Air Gets into the Cooling System The heater core is the main component of the cooling system. A car heater blowing cold air could be a symptom of the failure of the heating unit. If the electric heater fan comes on when you turn on the heater, but no heat seems to be coming out, you could have a blown circuit or there may be a break in the actual heater coil. You either turn it off, or turn the heat up farther to make it heat the air that is blowing. To find out if your heat pump is actually blowing cold air, hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). Some of this coolant is diverted from the cooling system into a heater core. This can be an easy fix depending on the symptoms. You see, a heat pump heats your home by moving heat from the outdoor air into your home. But if your car heater blows cold air and you’ve checked both heater core hoses to make sure they’re hot, you likely have a bum blend door actuator. You can usually diagnose and fix the problem yourself in about an hour. It turned on/off fan, flashed lights, but did not indicate any errors. In a properly working air conditioner, a fan will draw air over the evaporator coils, where it is cooled, and then be re-circulated back into the room. There could be various reasons for car heater not working but it basically happens for two reasons: air from the blower is not blow toward the heater core or the coolant does not flow through the heater core. Plugged Heater Cores Check to see if the coolant is flowing through the heater core with a non-contact thermometer. loopyshaz222 , Try and disassemble the fan as much as you can and use vacuum/compressed air to blow out all the dust/lint/etc. I hope this helped you out, if so let me know by pressing the helpful button. Other thermostat issues. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. If your heat pump is blowing some cold air, there are a few things that may be going wrong. by | Dec 30, 2020 | Uncategorized | | Dec 30, 2020 | Uncategorized | floorboard not wet like other autos I've had that had bad heater core. coolant level is good. 2 Answers. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. Only blowing cold air. Leaky Heat Valve Sometimes, a malfunctioning heat valve can also cause this problem to arise. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. A fan then blows on the core to blow warm into the air into the cabin. A fan blows air through the heater core, where it gets hot, and then into your car. DON’T ignore this problem. The heat in the Silverado is supplied by the hot engine coolant running through the engine cooling channels. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. 2008 Jeep Liberty ac working good. Both hoses on each side of the control valve located on … Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Solution: Change the air filter and see if your furnace starts only blowing warm air. A fan blows over your heater core and directs warm air into the cabin. Possible Conclusion 2: There’s a Problem that Needs Repair. When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. Quick Fix Follow the heater hoses all the way to the engine, and check … When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Most parts can be ordered directly from the manufacturer and installed quickly and easily. Before you can order the parts you need, you will want to check the unit thoroughly to detect the source of your problem. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. So what could cause hot air to blow through those vents? For those with gas furnaces, an outed that may have accumulated from base vents/motor and the loop to help bring back it's efficiency. There could be several reasons why it's not working properly. Find the procedure in a shop manual (at auto parts stores for about $20). 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