Loud Pop in the dash when outside temperature is cool. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-24-2006, 04:40 PM   #11
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It is the defrost/vent diverter flapper. If it closes too far it will jam in the duct and make a loud pop when it pulls loose. It is controlled by a long rod that goes up over the center hump by the gas pedal. I shortened it slightly (is adjustable) and it stopped popping.

Can test by going to DEFROST , wait a few seconds, and then back to VENT and it should pop again.
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Old 10-24-2006, 11:40 PM   #12
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This pop you hear. Is it the same pop that sounds like a bunch of coins being dropped in a plastic bin? It almost sounds like chattering, or somehting like that.


Is it caused by that rod, under the gas pedal? Hmm, I should take a look tommorrow.
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Old 10-28-2006, 11:00 AM   #13
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Tim,
Its more like one loud POP. Like popping a plastic bag.
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Old 11-25-2006, 05:08 PM   #14
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I noticed on a cool morning one day that if I started the car with the defroster instead of the heater on, there is no popping noise.
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Old 12-19-2006, 03:27 PM   #15
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Hmm thats interesting- mine has been doing this for a while now- only when its really cold out tho. So adjusting the rod will releive the problem?
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Old 12-21-2006, 01:26 PM   #16
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The problem is trying to get up there with your hand and adjusting the rod shorter. I still need to do mine. PITA
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Old 12-21-2006, 02:13 PM   #17
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fair enough. I seem to recall seeing that rod when I was doin some work to the car the other day. Maybe I'll try tonight. Thanks
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