Question about 1999 Buick Regal

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Have a 99 Buick Regal. The 'outside' temperature indicator is nuts. It starts out saying it is 50 degrees outside (it is closer to 85). The AC works at this point. Then the indicator shows the outside temp dropping quickly - down to -38 degrees - and then the heater comes on! Not great in the summer. Is this just a sensor problem? or the whole heat/AC system?

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  • yadayada
    yadayada Jul 07, 2010

    reaction of the outside temperature gage is not instant, if it were the display would constantly be moving, it displays averages and the car must be driven a certain speed and distance to satify the processor programming before it updates the diaplay.

  • Mike Heckendorf Aug 30, 2013

    I tried replacing the ambient air temp sensor mounted on the right side of the radiator. The connections appear to be clean. Can't get an accurate temperature reading and still have the heat coming on when it should be cooling the interior.


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I have the same exact problem! The temp sensor replacement did nothing for it either

Posted on Aug 05, 2010

  • dtrannyman Aug 05, 2010

    I take that back!! It didn't work on the initial try, but after a short time, it has been perfectly accurate ever since. Finally! This sensor can be had at local auto parts stores for about $10. On the regal, it is between the bumper and the radiator, clipped to the right side radiator support. It is the only one there and seen easily when the hood is open.

  • Lee Owens Mar 14, 2012

    When you say "short time" how long did it take? I replaced mine a couple days ago and it has had no effect


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