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03-21-2010, 05:49 PM
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#1 |
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Broken Down
Join Date: Dec 2006
Location: Choctaw, Oklahoma
Posts: 1,267
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Weak Defrost
My heater in my 82 works good will roast you out. But the defrost is lousy. Hot air comes out of the dash vents great, and when switched to the floor it comes out nice and strong. When you switch it to defrost its nowhere near the flow that comes from either the dash vent or floor. I checked the vacuum valve near the throttle pedal right at the floor heater exit and it is closing all the way when you select defrost just not much air comes out of the defrost vents. I'm tired of slow defrosting. Any help or suggestions would be greatly appreciated. I'm tired of chasing my tail here.
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kenm78 1982 Chevy 4X4 Project truck  “It’s better to keep your mouth shut and let people wonder about your ignorance, than open your mouth and reveal all doubt” |
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03-21-2010, 06:02 PM
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#2 |
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Account Suspended
Join Date: Jul 2008
Location: Where I come from, it's cornbread and chicken...
Posts: 3,122
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Re: Weak Defrost
where the defroster duct connects at the bottom inside the dash there might be a gap there...many guys have seen this in their trucks...you can take some a/c metal tape and tape it up and it should fix some of the problem...also, the foam that is between the connection that I'm talking about may also be worn out...
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03-21-2010, 08:02 PM
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#3 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,277
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Re: Weak Defrost
ive had the hoses come off the vents too..other than that its a matter of adjusting the doors if its a n on ac truck
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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03-23-2010, 06:38 AM
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#4 |
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Registered User
Join Date: Mar 2009
Location: glen burnie md
Posts: 174
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Re: Weak Defrost
I had an industrious mouse building a condominium in my heater defrost hoses with the seat padding. Also, if stuff from the dash has fallen into the vent housings, it's hard to get air through them. Try blowing compressed air through the ducts with a nozzle to see if crap blows out of them, wear goggles.
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