dash warning engine hot air conditioner off

Asked by Unpleasant Nov 16, 2021 at 08:08 PM about the 2010 GMC Sierra 1500 SLE

Question type: Maintenance & Repair

engine hot air conditioning off   comes on when I first crank truck. Could not
possibly be hot.What would cause this?Coolant is full.

2 Answers
307,225

Gene answered 2 years ago

ECT sensor or sensor wiring. Stuck open thermostat. Faulty ECM.

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400

Guru9H85Q3 answered 2 years ago

when the engine coolant becomes hotter than the normal operating temperature this message displays. So Check: cooling system cap not maintaining proper pressure. Electric cooling fans/cooling fans sensor defective/malfunctioning. stuck closed thermostat. blocked/restricted expansion cooling system tank. defective water pump. (Stuck Open Thermostat will result in OverCooling condition. Thanks

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