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I have a 2003 FX35 with 275.ooo miles, very well maintained. When driving, suddenly the heat goes off and the temperature guage rises. If I pull over and idle, temperature goes down, heat comes back on and I can drive a short distance before it starts over. Has not actually boiled over. Mechanic is stumped. Any suggestions?
 

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Sounds like a coolant flow issue.

EricTheCarGuy did a video on a car with similar issues. He explains that the only way to find the problem is by process of elimination. In his case, it was a bad water pump. However it could have just as easily been a bad thermostat or a clog in the radiator or elsewhere.
https://youtu.be/bt7_DhsTG_Q
 
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