The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - AC Cowl Vent not closing all the way on recirculate

phillipm · 08-06-2015, 11:53 AM

Okay guys worked on it last night. I did use a hand vacuum pump as davis suggested. Ended up being one of the screws that holds the firewall bushing in was too long and the door hit it as it rotated. Trimmed a few threads off of it and viola! Then I went ahead and replaced all of the vacuum lines that lead to the control panel and the vacuum reservoir. My control panel has 3 ports so I teed into the plunger line and capped off the 3rd port on the dash. This was to accommodate my new heater control valve which is a vacuum to close style. Thanks for the help!

08-06-2015, 11:53 AM	#6
phillipm Registered User Join Date: Oct 2014 Location: Scottsdale, AZ Posts: 465	Re: AC Cowl Vent not closing all the way on recirculate Okay guys worked on it last night. I did use a hand vacuum pump as davis suggested. Ended up being one of the screws that holds the firewall bushing in was too long and the door hit it as it rotated. Trimmed a few threads off of it and viola! Then I went ahead and replaced all of the vacuum lines that lead to the control panel and the vacuum reservoir. My control panel has 3 ports so I teed into the plunger line and capped off the 3rd port on the dash. This was to accommodate my new heater control valve which is a vacuum to close style. Thanks for the help!