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Don Barclay
Don ... 7/29/2010
1991 Mercedes Benz 350SDL Base 6Cyl3.4L - Engine
The temperature gauge is not working what is wrong
1 Answer
  • Blackwater
    Blackwater 7/29/2010
    The temperature sending unit is busted. Or your coolant temperature sensor is busted (this look like a small sparkplug)

    Check the wire to the sensor and be sure it is hooked up. If so remove it from the sending unit. Turn the ignition and have someone watch the gauge while you ground it to the engine. If it moves the sender is bad.
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