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11-01-2003, 12:10 AM
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#1 |
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Drive it like U stole it
Join Date: Mar 2000
Location: tunnel hill ,GA /Chatt,TN
Posts: 956
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Need some help please
My Grandfather inlaw has a 72 swb ac truck he bought new . he is having a problem with it recently ,when he turns on the defrost it doesnt blow out the upper vents . Insteed it blows out the lower but every position other than that works like it should . any ideas why and what should I look for? Thanks for any answers .
Brian
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71 custom 10 swb 72 nova ss 72 nova custom 87 s10 96 burb 94 camry 53 5 window 3100 |
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11-01-2003, 12:29 AM
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Weapons Of Construction
Join Date: Apr 2000
Location: Colorado, USA
Posts: 1,095
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I think it's called the diverter box. There's a flapper door that's probably no longer attached to the shaft. I think you can see the end of the shaft if you look up under the dash, to the right of the heater control panel. If the shaft is moving, but the air isn't changing to defrost, the flap isn't attached any more. Mine has the same problem.
You should be able to find a diverter box from one of the online suppliers here on the board. Changing it out might be a challenge, but it's worth it.
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1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO |
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11-01-2003, 10:48 AM
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Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
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Definitely sounds like the diverter box....
Replaced mine last year and curred all my woes. Inside the box is a plastic diverter gate with a rubber gasket all along the outside edges of it........over time they get brittle and break where it attaches to the operating rod....... You can change it out in a day.......... try these links.....got mine at half the cost of locally........ http://www.gmpartsdirect.com http://www.partszoneonline.com Need more help........drop a message...
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1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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11-01-2003, 11:58 AM
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#4 | |
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Weapons Of Construction
Join Date: Apr 2000
Location: Colorado, USA
Posts: 1,095
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Quote:
 Only one day?? Is that an 8 hour day, or w/ OT?  Actually, it probably isn't all that bad to change out. Usually, when I tear into something like that, I end up wrecking the glove box cardboard, pulling the wire out of the hoses, and slicing myself up on those little sharp pieces of metal that seem to jump out at you when your hands are up under the dash. 
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1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO |
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11-01-2003, 07:17 PM
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#5 |
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Drive it like U stole it
Join Date: Mar 2000
Location: tunnel hill ,GA /Chatt,TN
Posts: 956
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Thanks , I will look and see if i can figure it out.
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71 custom 10 swb 72 nova ss 72 nova custom 87 s10 96 burb 94 camry 53 5 window 3100 |
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