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What would cause a knocking sound behind the glove box on a Chevy Trailblazer?
Wiki User
∙ 14y ago
Only one thing there. The blower motor for the heating and AC. Turn it off and see if it still happens. A constant faint clicking sound may indicate a failing mode door actuator. If the blower does not seem like the issue and change in frequency of clicks with the speed setting then the mode door actuator and an inability to select air flow may be your problem. www.trailvoy.com
Wiki User
∙ 14y ago
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