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erratic temp gauge, high at idle, o.k. at about 2,00+ rpm 200

I have a 1986 240 DL Wagon.

The temperature gauge has started acting wacky.

About 200 miles ago the gauge would climb to the red zone when the engine was at idle, and then go back down to 1/2 at higher rpms.

The last time I started the car, the temperature gauge immediately climbed to the red zone. That just isn't right! There is no way the block could have heated up so much in about five seconds at idle.

There is enough coolant. It is more towards the "max" side of the reservoir.

Thanks for any help on this!






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