Heat only through defrost...
09-01-2009 | 10:02 PM
#1
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 33
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Year: 1996
Model: Grand Cherokee
Engine: I6
Heat only through defrost...
So my 96 GC has good heat, the problem is that it only comes through the defrost......What are the likely causes and solutions? I understand that it may be a vacuum issue.....Or is it the blend door and how do I tell? Thanks!
09-01-2009 | 10:17 PM
#2
CF Veteran
Joined: Aug 2008
Posts: 6,588
Likes: 494
From: Chico, CA
Year: 1986
Model: Cherokee
Engine: 4.3L with headers and full 3" exhaust system
The controls operate off vacuum motors. When you loose vacuum, the whole system goes to default, which is defrost. Yo have a vacuum leak, which you will need to chase down. Check your vacuum hoses, fittings and resevoir.
09-01-2009 | 10:57 PM
#3
Thread Starter
Junior Member
Joined: Aug 2009
Posts: 33
Likes: 0
Year: 1996
Model: Grand Cherokee
Engine: I6
The controls operate off vacuum motors. When you loose vacuum, the whole system goes to default, which is defrost. Yo have a vacuum leak, which you will need to chase down. Check your vacuum hoses, fittings and resevoir.
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