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Heater control

Digger140's Avatar

Join Date: Jan 2005
Posts: 27

01-08-05, 08:08 PM   #1  
Heater control

I have a 95 GMC jimmy and the heat and air blows from the defroster (at windshield) only checked heater control switch all vaccume lines are on and switch looks to be working any ideas thanks Herbie

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toyotaman11769's Avatar

Join Date: Jun 2002
Posts: 1,531

01-09-05, 04:42 AM   #2  
Check for vacuum at the control. The default position is defrost and hot when vacuum is lost.

Find the source on the engine and follow it back. Possible cracked/hose off.

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