air conditioner only works part of the time

Asked by Guru91B1NB Dec 16, 2021 at 03:33 PM about the 2008 GMC Envoy

Question type: Maintenance & Repair

air conditioner works and then stops blowing cool air.  When this occurs i
noticed the temperature guage in down at the zero level.  coolant is sufficient

2 Answers
310,255

Gene answered 2 years ago

If this has an HVAC system when the outside temp drops to under 41 degrees the AC system is shut down by the computer, so if the temperature reading is 0 then the AC will not work.

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157,615

James answered 2 years ago

Sounds like a problem with the coolant temperature sensor. Possibly a bad connection at the sensor. When the computer loses the signal from the coolant temperature sensor it assumes that the engine is overheating and takes steps to help prevent engine damage. One of those things is the air conditioning is disabled. The fact that the engine temperature gauge drops is also a good indicator that the coolant temperature sensor is the problem, or the wiring going to it. Hope that helps! Jim

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