Question about 2004 GMC Envoy

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Popping sound Well everytime I turn on my car, I hear this pop, pop, pop, pop and its only heard inside the car on top of the dashboard it turns off when I turn on the heat. Do you know what could be causing this noise? Please help me. I am afraid it's my ehaust. I have a system in the trunk, it's a 04 Envoy GMC.

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  • Anonymous Jan 21, 2009

    I have the same problem, ocassionally it will do it when I turn the car off.

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It sounds to me like you may a vaccuum line thats either leaking or detatched. What your hearing is the vaccuum controled vent system that determines where the air(a/c or heat) is directed out, at your windshield, dash vents, floor vents. . etc. Unless you smell exhaust, i wouldn't be concerned. Theres small plastic hoses behind the dash. have a person that knows what they're doing to take the dash apart if you can't do it. check these small lines for fit or cracks.

Posted on Jan 23, 2009

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