11-30-2010, 05:32 PM | #1 |
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Location: Eudora, KS
Posts: 131
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Heater Question
Anybody have a diagram or pics of the vacum lines from the heater control and where they go to? I gotta get some heat.
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11-30-2010, 10:40 PM | #2 |
78K & 79C Jimmys
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Location: Ottawa Ont CANADA
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Re: Heater Question
check these spots out
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
12-01-2010, 08:55 AM | #3 |
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Re: Heater Question
Thanks for the info. all that looks good now. I fabbed a metal piece to replace the plastic swing arm thingie. I took the heater controls out and there are a couple vacumn ports that don't have anything running to them and I don't what should be there. Are the vacumn valves like the one in the second picture bad about going out?
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12-01-2010, 11:38 AM | #4 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
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Re: Heater Question
I suppose they do quit but usally the hose is pinched,twisted,off somewhere...follow yours for nicks/cuts etc
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
12-17-2010, 10:00 AM | #5 |
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Re: Heater Question
Ok, still playing with this. So, far I have replaced water pump(needed anyway), heater core, thermostat, supply hose(it split taking it off), I fabbed a piece to replace the plastic thingie motornut picture. My heater is still not getting hot.
Would not having a fan shroud affect the heater, or could it be the fan clutch? |
12-17-2010, 12:37 PM | #6 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Heater Question
are the hoses getting warm to the core?
is the fan blowing air out? some people change the thermostats, just try covering the grill i cover mine once the temps get close to freezing till spring but if you see it overheat, you call pull it off the cold air threw the rad removes more heat then your makin the shroud could be worse concetrating the flow more but it cools better in the summer
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
12-17-2010, 01:19 PM | #7 |
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Location: Eudora, KS
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Re: Heater Question
Thanks for the help Motornut. I'll try covering the radiator as soon as I get the water temp gauge working.
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