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08-05-2015, 06:32 PM
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#1 |
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Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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AC Cowl Vent not closing all the way on recirculate
Been lurking and searching for a while, but cannot find an answer, so...
On my 71 factory air C10, I go to A/C inside air, my cowl fresh air door moves to close but its like the adjustment is off or there is not enough throw in the valve to close the door all the way. It only makes it about half way to where it needs to be to shut off the hot Phoenix summer air. Is there an adjustment? Or should I be looking for something particular to get it to close off completely? Thanks for the help! Phillip |
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08-05-2015, 06:34 PM
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#2 |
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Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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Re: AC Cowl Vent not closing all the way on recirculate
Do you have the spring on it ?
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08-05-2015, 06:39 PM
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#3 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,995
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Re: AC Cowl Vent not closing all the way on recirculate
Check the vacuum line for any cracks.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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08-05-2015, 06:54 PM
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#4 |
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Registered User
Join Date: Nov 2007
Location: Los Angeles, CA
Posts: 84
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Re: AC Cowl Vent not closing all the way on recirculate
Mine had a build up of leaves, sticks etc. that was keeping it from closing all the way.
__________________
1970 CST long bed Fleetside |
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08-05-2015, 09:09 PM
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#5 |
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Senior Member
  
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,807
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Re: AC Cowl Vent not closing all the way on recirculate
Try to close it with a vacuum pump.
__________________
other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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08-06-2015, 11:53 AM
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#6 |
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Registered User
Join Date: Oct 2014
Location: Scottsdale, AZ
Posts: 465
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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!
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