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Thread: Ext Temp issue in 05 Town Car

  1. #1
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    Default Ext Temp issue in 05 Town Car

    The Ext Temp in my 2005 Town car says 135 deg when I start the car. It goes down to may be 105-110 after 5-10 minute; the outside temp is about 30 deg.

    Now with this situation, when I turn the heat on, cold cold air comes out.

    Has anyone ever had such situation before? any solutions or ideas?

    ~Dee

  2. #2
    Junior Member rolls's Avatar
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    Best to have a mechanic look at it.. but here are some possibilities

    1) The thermostat has failed
    2) The heater valve is not opening fully - or at all.
    3) There is a blockage in one of the the heater hoses.
    4) The heater core is 'gunked up' (technical term ) and therefore blocked .
    5) There is air in the heater system (rather unlikely).

  3. #3
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    Quote Originally Posted by bluelimos View Post
    The Ext Temp in my 2005 Town car says 135 deg when I start the car. It goes down to may be 105-110 after 5-10 minute; the outside temp is about 30 deg.

    Now with this situation, when I turn the heat on, cold cold air comes out.

    Has anyone ever had such situation before? any solutions or ideas?

    ~Dee
    I had a car that the ext temp was doing the same thing. I don't think that has anything to do with the vent temp. Have you checked the inline water shut off valve on the hose under the hood?
    Jerry Thomas

  4. #4

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    I'm no mechanic but I am pretty sure those are two separate issues.
    On most cars the external temperature is read from a thermometer around the front grill or front bumper.
    Tony Franzetti
    Marriton Limousine, Austin, TX
    Austin Limousine service, Austin airport service, austin bus charters
    http://www.marritonlimo.com

  5. #5
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    I am going to go and check if the Ext temp is high when I turn on the ignition on. If yes, then I guess I got to change that temp gauge on the side of the grill.

    Many thanks

    ~Dee

  6. #6
    Senior Member Salicete's Avatar
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    Quote Originally Posted by TxLimoGuy View Post
    I'm no mechanic but I am pretty sure those are two separate issues.
    On most cars the external temperature is read from a thermometer around the front grill or front bumper.

    You are correct. The ambient temperature sensor has nothing to do with the engine temperature. Ten bucks says the problem is a $5 thermostat, about a 30 minute repair, even for an amateur.

  7. #7

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    Yeah those are 2 conveniently timed problems, unless you are in a BMW/Mercedes, the Temperature readout doesn't even register through your ECU, or any other component in your car, it would be just like your stereo, just an accessory. In BMWs, I know for sure, that every electronic thing is intergrated, at least in my m5, it would be a pain to put in a new radio, because the radio has more information sent to it than just music. Thermostats are cheap and quick to fix, but in today's economy I'd rather keep the $10, and put the money to the heater repair, because if it's 30 there, you probably need it.

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