Why is my car saying it's Over Heating, but then goes down when A/C is on

Asked by M1DLAND3BNK Nov 29, 2021 at 05:13 AM about the 2002 Chevrolet Monte Carlo LS FWD

Question type: Maintenance & Repair

I have a 2002 Monte Carlo LS 3.4 and the temp gauge shoots up but when I
turn on the A/C it goes below halfway almost instantly? What could cause this?
I've replaced water pump, thermostat, radiator, hoses, level sensor, temp
sensor, and I can't figure it out. Please help Me.

1 Answer
307,255

Gene answered 2 years ago

Engine Cooling fan is not turning on, possible fan relay, fan switch or wiring. AC bypasses the normal circuit so the fan runs and cools it down.

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