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I have a question regarding the coolant temperature sensor on my 89 740 Turbo. My car has the following:
1) dead temperature gauge
2) the idle drops to approx. 500 rpm before returning to 900 rpm after I rev up the engine and let it drop back to idle.
Can these two problems be related ? Also does the 740 uses similar compensation board on the back side of the instrument panel as 240 ? I am thinking about cleaning the board as I did with my 240, but I am not sure if Volvo did not use a more reliable piece on 740....
Thanks !!!
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