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Q: Only when it's really hot outside the temperature gauge reaches almost about less then half way. Car won't start up again till coo

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Only on hot days temp gauge reaches less then half way car won't start up again till completely cool down.. I give it gas it turns on but when I let the gas go it shuts off

My car has 200000 miles.
My car has an automatic transmission.

A: There may be 2 issues to deal with here. Th...

There may be 2 issues to deal with here. The inability of the engine to reach "normal operating temperature" (always the center of the gauge), indicates either a weak or failed thermostat, or a failed coolant temperature sending unit/coolant temp gauge. The difficulty starting and staying running is likely another issue such as a dirty idle air controller, throttle body, air leak in the intake system, etc. I would recommend YourMechanic dispatch a mobile, professional mechanic to your location to have them inspect your engine stalling and engine temperature issue.

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