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Thermostat dying? S70

posted by  Newbie on  Sun Mar 23 21:43 CST 2014
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last visit: Wed Jun 11 19:55 CST 2014
[RELATED]

Hi Everyone,
I have a 1999 S70 GLT with 162,000 miles on it. I am wondering if the thermostat or coolant sensor is bad? The temp gauge heats up slowly or normally and then gets stuck at about 4 o clock position. Then it slowly moves up to the 3 o clock position. The problem is that it normally moves up faster. But lately its been slow. In the mornings I can see that car is still cold and warming up slowly. All that exhaust you know.

Andrew








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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    This happened years ago on my 850. Once the thermostat was removed I found that it was broken resulting in a very slow warmup.

    --
    Zack 94' 850 Turbo Wagon (220k)



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Well I wanted to report back to confirm the results. I put the new thermostat in and did the first drive. It worked perfectly! The new thermostat drove the temp gauge up smoothly without any long pause like the old one. Gas milegage is also better!
      Wow, thanks for all who posted.
      Andrew



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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    I have a 99 V70 that had similar symptoms

    Changing the thermostat corrected the problem
    It was stuck in the open position



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Oh that is good. : ) Thanks for the input.
      I just got a new thermostat. I just have to put it and report back to help verify that was the problem.
      Andrew



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