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Temp red lines with AC on - - Thermostat - sending unit or both? 200 1992

Both my 240's have done a similar thing with the cooling system in good shape. Next time it does this, flick the guage several times with your finger as hard as possible, good chance it will go down. With such treatment, mine will go from very hot to normal or even register too cool. As others have noted, there may be a problem with the cooling system, but the temp gauge is less than reliable.
Aaron






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