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check heater blower motor blower wheel could be broken off The knocking comes from an Acctuator that has stripped out in the Hvac case. You Have to replace the acctuator to solve the problem.

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โˆ™ 2007-04-10 15:00:45
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Q: Where can you find information on fixing a knocking sound when you turn the ignition on or off The knocking is coming from air flow box passenger side under the dash 95 GMC 1500?
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