99 Cherokee-weird fan activity??

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Aug 10, 2011 | 04:00 PM

PJ_Hunter

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Joined: Apr 2011

Posts: 156

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From: Kremmling, CO

Year: 1999

Model: Cherokee

Engine: 4.0

99 Cherokee-weird fan activity??

Regardless whether I am heating, running AC or using the vent, The fan blows air thru the defroster, then it will switch to the dash vents, then back to defroster, then floor, then back to dash. All while leaving the **** on one position. It's starting to bug me. What could be wrong?

Aug 10, 2011 | 04:58 PM

VTJeep

CF Veteran

Joined: Jul 2010

Posts: 4,930

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From: 802

Year: 99

Model: Cherokee

Engine: 4.0

Vac line issue?

Aug 11, 2011 | 07:07 AM

PJ_Hunter

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Joined: Apr 2011

Posts: 156

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From: Kremmling, CO

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by VTJeep

Vac line issue?

I can check that. I didn't know if it was more a control box problem.

Aug 11, 2011 | 10:04 AM

btownxj

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Joined: Oct 2010

Posts: 99

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From: Bethlehem, PA

Year: 1992

Model: Cherokee

Engine: 4.0

yea sounds like a vacuum problem. when the controls loose vacuum they default to the defrost position. check your vacuum canister, it could be cracked or on a trail somewhere. its been awhile since i moved mine but i think its behind the fender liner on the pass side. i could be wrong somebody else can back me up on that.