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air con blowing cold air while on hot?

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  • 14-09-2008 9:35pm
    #1
    audismelly
    Closed Accounts Posts: 154 ✭✭


    hi lads
    drive 03 a4 tdi 100k. just this week when i turned tried to turn air con on hi, cold air blew out,i thought it would warm up, but it never did.
    basically it just blows cold air whether its on low or hi now.
    am trading or selling private very shortly.
    any ideas?


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    #2
    nite11owl
    Registered Users Posts: 19 ✭nite11owl


    not sure if im being stupid here but i thought air con was only supposed to blow cold. for use on those hot days... not that we get many here:D


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    #3
    colm_mcm
    Registered Users Posts: 73,456 ✭✭✭✭colm_mcm


    could be an electrical problem, or else a mechanical proble with the car's engine cooling system. best to bring it to a garage ASAP.


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    #4
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    colm_mcm wrote: »
    could be an electrical problem, or else a mechanical proble with the car's engine cooling system. best to bring it to a garage ASAP.

    your not serious:( cars running fine,thought it might be thermostat or sumthing.


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    #5
    Avns1s
    Registered Users Posts: 3,422 ✭✭✭Avns1s


    Does it blow out hot air when the air con is off?

    I assume that you're setting the temp control to "Hot".


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    #6
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    Does it blow out hot air when the air con is off?
    no it did before last week


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    #7
    colm_mcm
    Registered Users Posts: 73,456 ✭✭✭✭colm_mcm


    It very well may be a cabin thermostat or the dash control unit itself. but don't rule out the cooling system, and don't drive the car before you esablish that it's not the cooling system.

    there are a few online guides on this subject


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    #8
    Avns1s
    Registered Users Posts: 3,422 ✭✭✭Avns1s


    Could be thermostat stuck open... a problem would show up as the temp guage not reaching the "normal" operating temp section.

    Is there a chance that the heating control is broken. Not familiar with the Audi but I have seen other cars with a broken linkage between the knob or lever and the heater unit behind the dash.

    Also, have you checked your coolant level recently?


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    #9
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    Does it blow out hot air when the air con is off?

    I assume that you're setting the temp control to "Hot".
    yeah


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    #10
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    Could be thermostat stuck open... a problem would show up as the temp guage not reaching the "normal" operating temp section.

    Is there a chance that the heating control is broken. Not familiar with the Audi but I have seen other cars with a broken linkage between the knob or lever and the heater unit behind the dash.

    Also, have you checked your coolant level recently?

    coolant is bang on. well on the audi u can set the heats both sides differently , no heat on either side


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    #11
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    colm_mcm wrote: »
    It very well may be a cabin thermostat or the dash control unit itself. but don't rule out the cooling system, and don't drive the car before you esablish that it's not the cooling system.

    there are a few online guides on this subject


    been driving it like that over a week. il check online ,cheers.as im more than likely trading in, i dnt want to spend much more on it


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    #12
    Avns1s
    Registered Users Posts: 3,422 ✭✭✭Avns1s


    My guess is the sensors (as colm mentioned above) or some other part of the electronics controlling the heater.


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    #13
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    My guess is the sensors (as colm mentioned above) or some other part of the electronics controlling the heater.

    ok cheers thanks,would my mechanic be able to sort it, hes use to audis,passats,or would it have 2 go on computer:(


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    #14
    Avns1s
    Registered Users Posts: 3,422 ✭✭✭Avns1s


    That's a question probably best posed to the mechanic. Sorry.


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    #15
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    That's a question probably best posed to the mechanic. Sorry.

    no bother cheers


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    #16
    rebel.ranter
    Registered Users Posts: 3,570 ✭✭✭rebel.ranter


    It sounds like it's either the temp control on the dash or a sensor that detects the cabin temperature. Is the control a set of buttons or a dial? If buttons then I would wager that it is a cabin temperature sensor.

    To poster think air con is only for hot days, I find it brilliant for drying out the air on really wet days. When every one else is driving around with seriously misty windows or clear windows but roasting inside the car the air con ensures clear windows.


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    #17
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    rebel.ranter wrote: »
    It sounds like it's either the temp control on the dash or a sensor that detects the cabin temperature. Is the control a set of buttons or a dial? If buttons then I would wager that it is a cabin temperature sensor.
    yeah its buttons

    To poster think air con is only for hot days, I find it brilliant for drying out the air on really wet days. When every one else is driving around with seriously misty windows or clear windows but roasting inside the car the air con ensures clear windows.

    for sure


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    #18
    audismelly
    Closed Accounts Posts: 154 ✭✭audismelly


    Avns1s wrote: »
    My guess is the sensors (as colm mentioned above) or some other part of the electronics controlling the heater.

    sorry just have more info, its a dual air con, passenger side is heating, driver side is not.
    mechanic was busy ,he said it should be fine, he mite need to pull unit out and make sure button on driver side is making contact.


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