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Old 06-17-2013, 10:35 AM   #5
motornut
78K & 79C Jimmys
 
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Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: defrost not working

if it's the same as later years
my 88 here has the vac line into the controller above the gas pedal
inside the air box it had three spots for the control rod
it can be set up for always haveing some air up or down
or in the middle is all up or down
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1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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