radiator fans come on very high at cold start up a/c does not work

Asked by GartDYG57Z Apr 16, 2024 at 07:56 AM about the 2015 Buick LaCrosse Premium I AWD

Question type: Maintenance & Repair

2 Answers
310,255

Gene answered 7 months ago

Have it scanned, when the fans do this the computer is seeing a problem.

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157,615

James answered 7 months ago

The coolant temperature sensor is the problem. It's either disconnected or not sending a signal to the computer. When this happens the computer assumes the engine is overheating and takes steps to prevent engine damage. The radiator cooling fans come on immediately at high speed, and the air conditioning is disabled. The check engine or service engine soon light will come on as well. Jim

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