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ignition switch wasn't the problem 850

When your temp needle drops down, if it still does, can you check the codes on A-7, the instrument cluster? There is a code for no signal from ECT sensor. Same for rpm which comes from the CPS.

Jumping backward from another car can destroy the ignition module and/or the engine computer. Hopefully, that didn't happen.

I doubt that the instrument cluster is at fault.

Did you check the ground wires???
--
My back feels better when I sit in a Volvo seat






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