Why is my temp guage on my 1997 Ford f150 pegging out when I run the ac?

Asked by Aug 14, 2015 at 05:08 PM about the 1997 Ford F-150 XLT Stepside SB

Question type: Maintenance & Repair

When I run AC my temp guage pegs out if  I turn AC off it returns to normal the engine is
not actually running hot.

2 Answers

116,525

I would clean the exterior of the raditor with a good cleaner and I would also flush the entire cooling system and add new antifreeze to the system.

22,070

The AC running would have nothing to do with the temp gauge pegging out if the engine is not operating above temp. While changing the antifreeze and cleaning the radiator try a new thermostat. NOTE: Never add just water to a radiator if it is low. Plain water in a radiator will actually make the engine run hotter.

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