Question about 2002 GMC Sierra
Check for a broken or loose vacuum hose under the hood also........
Posted on Aug 15, 2008
The way the vehicle moves the "flap" inside the dash from position to another to allow air to blow is through a vacuum system, check the vacuum line going to the control unit and if htat is not it, check the vacuum lines leading to the actual flap
Posted on Aug 06, 2008
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Posted on Jan 02, 2017
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