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Hissing sound through ac vents

 
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Old 15 Sep 2015, 06:27 pm
Young Cruiser
 
Join Date: Aug 2014
Location: columbus ohio
Posts: 73
Default Hissing sound through ac vents

So I've been driving my PT a little more often, when the car is idling you can hear a hissing sound coming through the AC vents. It almost sounds like when air is released through a valve stem in a tire. Under acceleration the sound goes away. Does the AC system have actuators that are vacuum operated and would that coincide with a slight drop in boost pressure? I'm only at 7 psi under wide open throttle. I havent made a boost leak tester yet. Thats my weekend project.
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Old 16 Sep 2015, 09:36 am
Fresh Cruiser
 
Join Date: Sep 2015
Location: Broken Arrow, OK
Posts: 7
Default Re: Hissing sound through ac vents

I had the same problem with my old cruiser, it was a 2008 PT classic. This problem doesn't really revolve around the turbo. I never found the solution to the problem, I was thinking of low radiator fluid or low coolant.
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Old 16 Sep 2015, 10:16 am
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Join Date: Aug 2015
Location: Lake Wales, FL
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Default Re: Hissing sound through ac vents

Maybe the check valve on the power brake booster is bad. I've had cars in the past that the a/c would stop blowing out of the vents when accelertating or going up a steep hill. The solution was replacing the check valve. I don't know if this'll work for you or not. It's just a suggestion. I'd be interested to see how you make the boost leak tester. I may want to do that too!
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Old 16 Sep 2015, 10:59 am
Young Cruiser
 
Join Date: Aug 2014
Location: columbus ohio
Posts: 73
Default Re: Hissing sound through ac vents

Just google srt4 boost leak tester. Lots of diy's. Ill snag a valve from my parts bin and swap it out
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