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Thread: My heater is blowing cold air.

  1. #1
    Ridin Dirty dom's Avatar
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    Question My heater is blowing cold air.

    Freezing cold outside and the heater in my car does not seem to be working.

    When I turn on the heater it is blowing cold air.

    Why is my heater blowing cold air?

    My car heater is not working! -doh

    "Tutto nello Stato, niente al di fuori dello Stato, nulla contro lo Stato "
    -Mussolini
    All within the state, nothing outside the state, nothing against the state.

  2. #2
    Administrator Ken's Avatar
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    Quote Originally Posted by dom View Post
    Freezing cold outside and the heater in my car does not seem to be working.

    When I turn on the heater it is blowing cold air.

    Why is my heater blowing cold air?

    My car heater is not working! -doh
    Suggestions, Dom.

    1. Your engine has frozen, the block has cracked wide open and all the coolant has drained away - terminal engine failure imminent.

    2. Your heater radiator has frozen and the ice has burst it wide open and all the coolant has drained away - terminal engine failure imminent.

    3. Both 1. & 2. above have occured simultaneoously - terminal engine failure very imminent.

    4. The thermostat has stuck open and the engine is taking forever to warm up - terminal failure not imminent, collect a bonus point.

    5. The heater valve is stuck, simple to check and rectify - failure not imminent, collect another bonus point.

    6. The flap valve that selects and directs the airflow is stuck is stuck or disconnected - engine failure not even on the horizon.

    7. It could be none of the above and something else, even more ghastly, has occured - total engine failure happening already, windshield will crack, wheels are about to fall off, the shift lever will come off in your hand, the Rear Sear Retainer Keeper Spring Actuating Pawl Hasp is about to disintegrate and your life will never be the same again.

    I would check out 4, 5 and 6, Dom.

    Oh, by the way have a Happy Christmas.

    Ken.
    Die dulci fruimini!
    Ken.
    Wolds Bikers, Lincolnshire, England.

  3. #3
    Senior Member
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    Quote Originally Posted by dom View Post
    Freezing cold outside and the heater in my car does not seem to be working.

    When I turn on the heater it is blowing cold air.

    Why is my heater blowing cold air?

    My car heater is not working! -doh
    Adding to Ken's good advice:

    Check to make sure your engine is running.

    It could be the Framis valve!

  4. #4
    Senior Member DonTom's Avatar
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    Quote Originally Posted by dom View Post
    Freezing cold outside and the heater in my car does not seem to be working.

    When I turn on the heater it is blowing cold air.

    Why is my heater blowing cold air?

    My car heater is not working! -doh
    If you have a temperature gauge and it reads slighter HIGHER (this is not a mistake) than normal but your heater does not work, check your coolant (antifreeze) level.

    Or just check your coolant level. If just a little low you can get cold air from the heater in many vehicles. Heater cores need the maximum water though them or they won't get hot enough.

    -Don-

  5. #5
    Administrator Ken's Avatar
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    Quote Originally Posted by DonTom View Post
    If you have a temperature gauge and it reads slighter HIGHER (this is not a mistake) than normal but your heater does not work, check your coolant (antifreeze) level.

    Or just check your coolant level. If just a little low you can get cold air from the heater in many vehicles. Heater cores need the maximum water though them or they won't get hot enough.

    -Don-
    Good point, Don. Also, depending upon where the temperature sensor is fitted, it sometime happens that the temperature shows slightly lower than usual. This can happen where the sensor is high on the cylinder head and below the level of the remaining water. The sensor picks up heat from the cyl head and stays low until the system boils up (assuming there us still some water left). In my case the engine was completely empty as the 'Bang' I thought was a fan belt failing was actually a variable pitch fan blade coming off and chopping out the bottom of the radiator. That was in the days when I lubed my cars using a Duckhams Q20/50 and STP mix. Thinking I had just lost the fan belt I ran the car, about twelve miles I think, home, flat out, thinking I was improving the cooling through the rad by increasing the airflow. It was only the next day I found the hole in the radiator. I stripped the engine, a much modified Mini Cooper, and thanks to the STP there was no damage, after rebuild the engine continued to run perfectly.

    Ken.
    Die dulci fruimini!
    Ken.
    Wolds Bikers, Lincolnshire, England.

  6. #6
    Senior Member grouch's Avatar
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    Um.........you are using a heat setting, not a/c aren't you?
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  7. #7
    Ridin Dirty dom's Avatar
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    Thanks for all the input guys!

    Looks like it was partially clogged heater core.

    "Tutto nello Stato, niente al di fuori dello Stato, nulla contro lo Stato "
    -Mussolini
    All within the state, nothing outside the state, nothing against the state.

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