A\C - Defroster Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue Beard · 01-28-2003, 08:26 PM

Having problems with A/C and Defroster.

When trying to get the defroster to work the air just keeps coming out the air ducts.

Replaced all the duct work, checked the vacuum lines. and electrics seem to be working okay.

Any help at this point would be way beyond a big help.

Blue Beard

mtdave2 · 01-28-2003, 08:28 PM

the door is broke in the diverter. the big black duct under the dash, the door breaks right at the pivot rod. when you move the lever, the rod turns, but the door just stays there

i fixed my with some really good apoxy and 2 large washers. or you can just buy a new diverter.

Andy4639 · 01-28-2003, 08:43 PM

This is what I would check first. The cable on the front side of the heater vent, where the air should blow out. Look at the cable and make sure it is hooked up.On mine the screw holding it had come out. The cable was just sliding back and forth. Take your hand and work it back and forth and see if it makes any difference, if not the your flapper inside is torn. You can try and fix it are do as I did and buy a new one.

**PICKMUP** · 01-29-2003, 12:44 AM

mtdave2 is right...the door is broken! If you take the box off you will see you can hold the door and turn the shaft. It fools a lot of people when they see the shaft move on the outside, they think it is working.

GREEN70-72 · 01-30-2003, 08:45 AM

OK OK MINE IS BROKE, FIGURES, SO WERE CAN I GET JUST THE DIVIDER AND NOT THE WHOLE BOX ASSEMBLY? I WOULD LIKE TO JUST REPLACE IT INSTEAD OF TRYING TO FIX IT. ITS BROKE GOOD!
THANKS CHRIS

bmg · 01-30-2003, 10:59 AM

No one sells just the flap....you have to buy the whole diverter or fabricate one..i have same prob and till summer i just taped it shut or open can't remember to get heat out of the top defrosters. "Ricks" offered me a steal but i could not afford it 65.00 for the diverter box.

Blue Beard · 01-30-2003, 11:27 AM

bmg:

Is Ricks a company that sells the diverter box?

If so, do you have a web address or phone number.

I too may be in the need of one. Currently having problems.

There was a post on using strong epoxy on this unit.

Thanks

mtdave2 · 01-30-2003, 11:36 AM

really its not hard to fix.. 3 years now still working fine

Hutch · 01-30-2003, 02:01 PM

Just get a new diverter box.
GMC Pauls has em.

GMC Pauls

bmg · 01-30-2003, 05:33 PM

http://www.****************.com/

there is the link to his site, i had called about 7 months ago tho sure the price went up.

GMC Jim · 01-30-2003, 08:10 PM

fixed the flap with fiberglass cloth and expoxy resin.... stonger than new; works fine...... get the resin and cloth from a boat dealer.........Jim

01-28-2003, 08:26 PM	#1
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	A\C - Defroster Problems Having problems with A/C and Defroster. When trying to get the defroster to work the air just keeps coming out the air ducts. Replaced all the duct work, checked the vacuum lines. and electrics seem to be working okay. Any help at this point would be way beyond a big help. Blue Beard __________________ 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

01-28-2003, 08:28 PM	#2
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	the door is broke in the diverter. the big black duct under the dash, the door breaks right at the pivot rod. when you move the lever, the rod turns, but the door just stays there i fixed my with some really good apoxy and 2 large washers. or you can just buy a new diverter. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

01-28-2003, 08:43 PM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	A\C - Defroster Problems This is what I would check first. The cable on the front side of the heater vent, where the air should blow out. Look at the cable and make sure it is hooked up.On mine the screw holding it had come out. The cable was just sliding back and forth. Take your hand and work it back and forth and see if it makes any difference, if not the your flapper inside is torn. You can try and fix it are do as I did and buy a new one. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-29-2003, 12:44 AM	#4
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,158	mtdave2 is right...the door is broken! If you take the box off you will see you can hold the door and turn the shaft. It fools a lot of people when they see the shaft move on the outside, they think it is working. __________________ Email: frankeham@comcast.net Phone: 360-956-7170

01-30-2003, 11:27 AM	#7
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Ricks bmg: Is Ricks a company that sells the diverter box? If so, do you have a web address or phone number. I too may be in the need of one. Currently having problems. There was a post on using strong epoxy on this unit. Thanks __________________ 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

01-30-2003, 08:45 AM	#5
GREEN70-72 Registered User Join Date: Feb 2002 Location: CRESTVIEW,FL,US Posts: 355	OK OK MINE IS BROKE, FIGURES, SO WERE CAN I GET JUST THE DIVIDER AND NOT THE WHOLE BOX ASSEMBLY? I WOULD LIKE TO JUST REPLACE IT INSTEAD OF TRYING TO FIX IT. ITS BROKE GOOD! THANKS CHRIS

01-30-2003, 10:59 AM	#6
bmg Registered User Join Date: Nov 2001 Location: Indianapolis, IN USA Posts: 157	No one sells just the flap....you have to buy the whole diverter or fabricate one..i have same prob and till summer i just taped it shut or open can't remember to get heat out of the top defrosters. "Ricks" offered me a steal but i could not afford it 65.00 for the diverter box.

01-30-2003, 11:36 AM	#8
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	really its not hard to fix.. 3 years now still working fine __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

01-30-2003, 02:01 PM	#9
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	Just get a new diverter box. GMC Pauls has em. GMC Pauls __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

01-30-2003, 05:33 PM	#10
bmg Registered User Join Date: Nov 2001 Location: Indianapolis, IN USA Posts: 157	http://www.****************.com/ there is the link to his site, i had called about 7 months ago tho sure the price went up.

01-30-2003, 08:10 PM	#11
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	fixed the flap with fiberglass cloth and expoxy resin.... stonger than new; works fine...... get the resin and cloth from a boat dealer.........Jim __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).



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