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Old 07-17-2018, 10:59 AM   #6
jchav62
1962 C-10
 
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Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
Re: A strange interior gear sound.. Huh?

On my old 2004, I used to go up just a hair, like 1/8" on the temperature control and it would stop the thumping noise without affecting the temp of the A/C.
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Joseph Chavez
"See the USA in a Chevrolet!!"
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1962 C10 Shortbed Fleetside 327/th350 GV overdrive
1974 C10 Longbed Fleetside 350/th350 "The Trash Truck"
1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4
2015 GMC Sierra SLE 1500 4x4
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