Q: Heat issues

asked by on December 03, 2016

When in idle for extended periods of time, the vehicles temperature goes up, once moving again the temperature goes back to normal. when heat is on, temperature fluctuates as well. Heat works for first few minutes of being on then stops working, this is when the vehicle temp will rise. What is the most likely cause?

My car has 140000 miles.
My car has an automatic transmission.

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