The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Normal to hear vacume sound in AC controls?

tucsonjwt · 06-01-2011, 02:37 PM

I have never heard a vacuum leak from A/C controls, but I do hear the vacuum actuators when they engage/disengage and occasionally hear a hiss when the A/C starts up. But if the A/C is functioning properly I would not be concerned about it.

06-01-2011, 02:37 PM	#2
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,198	Re: Normal to hear vacume sound in AC controls? I have never heard a vacuum leak from A/C controls, but I do hear the vacuum actuators when they engage/disengage and occasionally hear a hiss when the A/C starts up. But if the A/C is functioning properly I would not be concerned about it.