Hissing noise when turning a/c off
Thread Starter
Registered User
Joined: Nov 2010
Posts: 180
From: Georgia
Hissing noise when turning a/c off
My a/c makes a hissing noise when I turn it off for a few seconds then quits? Would this be a vaccine leak or normal operation
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Registered User
Joined: Dec 1969
Posts: 27,727
From: Little Rock, AR
Re: Hissing noise when turning a/c off
Are you talking about inside the car when you move the mode control? It is vacuum operated, so yeah it will hiss for a few seconds as it bleeds off the vacuum. It has nothing to do with a vaccine. 
Thread Starter
Registered User
Joined: Nov 2010
Posts: 180
From: Georgia
Meant to say vacuum. Stupid auto correct. But anyways I was wondering because where all 3 vacuum lines meet at the check valve under the hood in my car had no check halfheartedness it was just a 3 way port for them all 3 to connect to. It was shaped like a fork in a road so I replace it with the correct check valve from GM. Wanted to make sure I didn't screw anything up
Posted from Camaroz28.com App for Android
Posted from Camaroz28.com App for Android
Registered User
Joined: Dec 1969
Posts: 27,727
From: Little Rock, AR
Re: Hissing noise when turning a/c off
Meant to say vacuum. Stupid auto correct. But anyways I was wondering because where all 3 vacuum lines meet at the check valve under the hood in my car had no check halfheartedness it was just a 3 way port for them all 3 to connect to. It was shaped like a fork in a road so I replace it with the correct check valve from GM. Wanted to make sure I didn't screw anything up
Posted from Camaroz28.com App for Android
Posted from Camaroz28.com App for Android
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