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11-16-2005, 04:26 PM
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#1 |
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Registered User
Join Date: Jul 2004
Location: Dayton, Ohio
Posts: 36
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Heater/Defroster Help
I am having issues with my heater/defroster on my 85 Burb. Maybe it's a common thing, maybe I have bigger issues, but anyway, here it is. All air comes out of the vents on the Dash. Some air will come out the defrost, but not enough to accomplish anything, when the defroster is turned on. The burb has air, and when I switch on the air the condenser seems to kick on. Is there something that get's stuck that I can check?
Thanx MAS |
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11-16-2005, 09:21 PM
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#2 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Re: Heater/Defroster Help
Vaccum leak. When you move the selector from ac-vent-heat-defrost you should "hear" the vaccum change a door in the ductwork to redirect the air.
__________________
1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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11-17-2005, 01:38 PM
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#3 |
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Registered User
Join Date: May 2005
Location: Anaheim, CA
Posts: 103
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Re: Heater/Defroster Help
My '91 Sub does the dame danged thing!!! WHERE is there a vacuum leak??
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Ken '60 GMC 3/4T 4x4 '60 GMC Suburban 4x4 '64 GMC Suburban 4x4 |
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11-23-2005, 06:13 AM
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#4 |
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user # 2756
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Re: Heater/Defroster Help
could be under the dash or in the engine compartment, you'll see the lines that go through the firewall near where all the windshield washer lines are.
__________________
1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm
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12-01-2005, 09:38 PM
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#5 |
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Active Member
Join Date: Mar 2005
Location: Annapolis, MD
Posts: 183
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Re: Heater/Defroster Help
It is the vacuum selector in the dash control. The selector is a small black plastic part that when you move the slide it changes the positions. GM still makes the part
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