My 2005 Chevy Silverado AC Cutting Off Above 20MPH

Justin’s question:

My 2005 Silverado is driving me nuts in this heat. The ac blows great, until I get over twenty miles an hour, then it shuts right off. It could sit all day idling, and be cold as ice. But once I drive over twenty, wham, it stops blowing cold air. HELP!”

Answer:

I’ve seen that happen before. They’ve had nothing but problems with the control heads for the AC and Heating system on those trucks. The one I fixed just needed a new control head, and they had plenty for sale at the dealer (since they break down so much.) Somehow the computer circuits inside the control head just break down a lot and then just turn the AC off. They can break at any time, but I have seen them cut off at certain speeds only in those trucks, which seems pretty weird but what do you expect with computers?


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