heating cooling Fan is blowing high speed

Gtahoe

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Hi all, got a 2021 Tahoe. The heating cooling fan speed was normal for a few months. Now when I get it and drive the fan kicks up to some crazy high speed, unit I hit the 'synch' button, then it drops down to a more normal speed. Thanks for any thoughts.
 

corima

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I had similar. I could not adjust climate control from the knobs, only thru the screen. Default was max heat. dealer kept it a week and changed some climate control parts.
 

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