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Hissing Sound

Just_Gerald

By Just_Gerald
in Ask A GM Technician

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Just_Gerald New Member

Just_Gerald

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Recently noticed a new sound on my 2001 GMC Sierra (2wd, 4.8, automatic). When accelerating when the truck is shifting from 3rd to 4th there is a pressurized hiss sound for about 1 second. I did some investigation at 70 and found that the sound does not occur when the AC is off (At least I can't hear it any more). Any ideas on where to start looking for the cause of this sound? I was thinking it was a valve in the tranny sticking but the AC connection baffles me.

 

Thanks for the help

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