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Thread: Help: Car drops temperature and runs cold when driving on highway at 55+ MPH only

  1. #1
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    Default Help: Car drops temperature and runs cold when driving on highway at 55+MPH only.

    Help.

    I've recently had my alternator replaced (new) and began noticing that my cars temperature drops significatly when driving on the highway at 55+ MPH. I notice this only happening when driving on the highway and when driving on the street (20-30 MPH) the engines temparature runs normal...btw, it's Winter here in Illinois.
    I once stopped the car when the temperature droped and checked the coolant hose - didnt feel hot at all compared to when the car runs on the streets.
    Since noticing this problem I've had the following replaced; new radiator, new thermostat, new inginition cable.

    Car startup warmup is fine, take about 3-5 minutes to fully warm up.
    Again car runs hot and heater works fine only when driving on streets.

    Car year: 99
    Mileage: 111000

    Thank you.
    Last edited by cg312; 01-19-2004 at 11:48 AM.

  2. #2
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    hmmmm, that's a head scratcher... what car is it? Was it a high performance rad? that's High milage for a 99.
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    She wishes it was deep.
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    So deep put her ass to sleep.

  3. #3
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    Smile

    No rad. 1999 Chevrolet Cavalier 2.2L

    I know I've put quite a few miles on this one, all highway miles.

  4. #4
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    i have the same problem as you. replaced the tstat with a higher temp one but it only helped a bit. actually u can see the temp drop when i rev high.

    still havent gotten anywhere.

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