Chevy Tahoe vent controls

Old 02-27-11, 06:27 PM
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Chevy Tahoe vent controls

I have a '99 Chevy Tahoe that has a problem with air flow routing. All of my air is diverted to floor vents & I can't get it to switch to my defrost or dash vents. Any suggestions on where / what to troubleshoot?

Old 02-28-11, 04:54 AM
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Not the most fun to troubleshoot. You'll need to locate the actuators for the blend doors in the ducting. Could be mechanical, electrical, or vacuum-operated. Either you have a bad actuator, or bad signal to the actuator - broken/disconnected cable, bad electrical connection, or vacuum leak. Sometimes all the actuating components will be working perfectly, but there will be a structural failure of one of the doors or its actuating mechanism causing it to remain in one position. I have to warn you, this can be pretty challenging.

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