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10-07-2010, 01:34 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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87 GMC heater problems
Does anyone have or know where I could find a diagram of the vacuum layout for the heat / AC system in my truck. I know I have a vacuum leak I can hear it but I cant seem to find it.
Truck is a 1987 GMC 3500 with AC. Any help or direction would be appreciated |
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10-07-2010, 03:48 PM
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#2 |
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Registered User
Join Date: Dec 2009
Location: Columbus ohio
Posts: 109
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Re: 87 GMC heater problems
You can spray carb cleaner around the vac. lines until the idle changes. When the idle changes you just found where you leak is.
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10-07-2010, 03:51 PM
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#3 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 87 GMC heater problems
don't think i got a diagram but this is one spot to check out
It is a pop spot for a leak where do you here the leak in the cab ,which side ,under/around the controls?
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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10-07-2010, 10:01 PM
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#4 |
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Registered User
Join Date: Aug 2010
Location: N.Canton, Ohio
Posts: 70
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Re: 87 GMC heater problems
The leak (whistle) is coming from the dash deep in the center behind the heater controls.
Also I know there is a leak or a problem because the defrost vents will not work. I have the dash pad off and I will be looking into it real serious this weekend, just figured if there was a diagram available it would be a start...........no big deal I will just start hunting through till I see something that doesnt look right. I will check that selector first though easy enough to get to. Thanks |
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