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The heater kicks on but only blows cold air

No matter how long i let the car run with the heater on, it continually blows cold air. i tried each different setting on the heater and it still blows cold air.

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Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Posted on Jan 03, 2013

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Cold air getting in at the drivers right foot


That is typical for most cars. The front lower (foot area) vents allow cold air to come in just before the heater kicks in (heat value opens). If this just started, may be wait for a warm / hot day and see it continues. Sometimes people forget as this typically happen only on colder days. I wouldn't worry about it. To make it stop, turn off the heater - A/C and wait for the car to warm up before turning on the heater. The car is warm once the engine temp gauge starts to move up / show warmer. In most typical cars it takes about 5 to 7 minutes running get the engine temp up to a point where the heater will blow warmer air. If you have more details / concerns - post them, the more you include (car make, model & year, when did the problem start, anything make it worse or better, influencing conditions e.g. rain, cold, hot, dry, etc the better).

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You got a bad heater door module most likely or the door itself may have issue.

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There is a separate heater core, like a small radiator, which needs hot water running through it, so when the air blows over it, the air gets hot. It sounds like the diverter valve which sends the hot water to this heater core is not working. It could be a problem with the valve itself, or the relay or switch that controls it, or the vacuum line or device that opens the valve when the switch or relay tells it to open.

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A/C blows good cold air and everything works as it should, however when I turn the A/C on (doesn't matter what fan speed) I hear a constant clicking/ticking noise coming from what sounds like a fan


What you are most likely hearing is the compressor kicking on/off. The constant kicking could be a sign that there's insufficient refrigerant to keep the compressor running continuously without shutting on/off. Eventually, the compressor won't kick on at all, a safety feature designed to prevent doing damage to a compressor that's undercharged. Have the AC system checked.

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the heater control valve on the engine's firewall may be out of adjustment. There shouldn't be a gap in the valve when the a/c is on max cold.

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I had the same problem with the heater only working when accellerating. Found the overflow tank pick up tube was kinked. This of course made my coolant level low. So when the cars hot the coolant would push into the overflow, but when the car cooled the kink would prevent it from flowing back to the radiator.

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