Temperature gauge
3 Answers
The above answers are correct, but I would first check the temperature sending unit, if there are no leaks under the car. If there is air in the system, fluid had to come out somewhere if you don't already have a cracked head gasket and blowing the antifreeze through the exhaust.
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could be a sticking thermostat iv seen this happen. fixed 2 with the same problem of your complaint last week.
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Andrew Wynn answered 4 years ago
It the temp gauge returns to normal after turning the car off and back on, it's a known error in the DME that causes this problem.