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Temp gauge drops to cold when going down a hill

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Temp gauge drops to cold when going down a hill

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    Temp gauge drops to cold when going down a hill

    92 Teg just had coolant flushed and mechanic checked thermostat and says that it's working fine. I was sure that it was the thermostat stuck in open state.

    This was happening before and after the coolant flush. Normal driving in city, temp guage is just under 1/2. When driving at highway speeds, the temp guage is about at 1/4. When going down a hill, temp guage drops down to 0 (ie. COLD).

    What could be causing this? Bad Temperature Sensor? If so why does it work fine when driving around in the city. It's really bad when driving down a steep hill. If it is a bad sensor, then where is the temperature sensor located? Is it easy to replace?

    Thanx in advance.

    #2
    If I was you I'd just switch out the thermostat anyway, it's only 7 dollars at most. If that doesn't work then it has to be the sensor.

    HTH

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      #3
      Did you use the right amount of coolant? If you dont use coolant, the temps wont stay up and itll stay cold

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        #4
        Temp guage not cold anymore

        Just an update:

        Mechanic took out thermostat and yes it was stuck open. They replaced it with a new one. Drove it for a while and the car overheated !!!!!!!! They took it out and found that the new thermostat didn't open at all. It was stuck closed. They said it was a bad thermostat that they put in. DAMN them ! So they installed a new one for me. Now the Temp Guage is around middle....but NO HEAT is coming out of my HEATER when I'm idling. When I start moving, then the HEATER starts working. What could be wrong? Could it be my heater core?

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          #5
          theres air in the system have to bleed it

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