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10-12-2010, 07:06 PM
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#1 |
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Registered User
Join Date: Aug 2010
Location: N.Canton, Ohio
Posts: 70
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Heater control vacuum
Well I think I found my problem tonight as to why my defrost vents will not open.
After reading numerous threads on here I starting checking in the engine bay first, and sure enough there was a vacuum line with a tee sitting wide open with no line to it. One end goes into the fire wall by the heater box the other end goes to a funny looking ball thing about double the size of a softball over by the brake booster. Now I just have to find a good vacuum port to take of of the engine somewhere and verify that that is it. Kinda figures the truck came from Alabama and had a new engine put in it, i bet they never even gave a crap about hooking it up. |
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10-12-2010, 09:20 PM
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#2 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Heater control vacuum
these may help cover some issues
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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10-13-2010, 08:15 AM
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#3 |
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Registered User
Join Date: Aug 2010
Location: N.Canton, Ohio
Posts: 70
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Re: Heater control vacuum
The A/C vac line and the big ball is what is not connected to the engine. There is just an open tee back behind the carb. I will try to hook it up tonight and see if that cures it.
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Linear Mode
