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94 Jeep GC- HVAC fan runs WFO with the key off. #2649784 04/28/19 09:10 AM 04/28/19 09:10 AM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	The HVAC blower motor on Pop's 94 Jeep GC runs WFO with the ignition key removed. I looked at a shop manual and suspect that a relay or control module might be the problem. The manual didn't show the physical location of any of these components. I'm guessing I need to pull the dash to find them. Has anyone seen or fixed an issue like this? The Jeep also has the Automatic Temperature Control option. I tried pulling all of the relays and connectors that I could physically reach with no luck. Also, the AC compressor will not come on while the fan is in this WFO mode.

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: 74RALLYE] #2649830 04/28/19 11:11 AM 04/28/19 11:11 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	WFO is Wide F+++ Open? I would think the main fuse for the blower would be under the hood in the big fuse box. Did you pull that? [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: Mr.Yuck] #2649845 04/28/19 11:35 AM 04/28/19 11:35 AM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	Yes, the fuse will shut down the blower motor, but that doesn't fix the problem.

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: 74RALLYE] #2649877 04/28/19 12:59 PM 04/28/19 12:59 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	I know nothing but duck duck go comes up with this one https://www.2carpros.com/questions/1993-jeep-grand-cherokee-blower-motor-wont-turn-off it's a head scratcher They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: Supercuda] #2649880 04/28/19 01:09 PM 04/28/19 01:09 PM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	Thanks for the link, but I finally found a thread on a Jeep forum that matches my problem. It's likely the motor control resistor. You would think a resistor only goes open when defective, but I think it's more like a solid state speed controller.

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: 74RALLYE] #2649889 04/28/19 01:21 PM 04/28/19 01:21 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Pretty sure they are two names for the same thing. RA has them, price isn't too bad unless you have the automatic temperature control setup, then it's pricey. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: 74RALLYE] #2650005 04/28/19 08:43 PM 04/28/19 08:43 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Originally Posted by 74RALLYE Yes, the fuse will shut down the blower motor, but that doesn't fix the problem. yes I know, just so you could shut it off until u figure it out. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: 74RALLYE] #2650047 04/28/19 11:13 PM 04/28/19 11:13 PM
Joined: Jun 2003 Posts: 21,404 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,404 It's a dry heat	Originally Posted by 74RALLYE Thanks for the link, but I finally found a thread on a Jeep forum that matches my problem. It's likely the motor control resistor. You would think a resistor only goes open when defective, but I think it's more like a solid state speed controller. Pretty common actually . Ive had the main control assy do the same thing. just not near as common

Re: 94 Jeep GC- HVAC fan runs WFO with the key off. [Re: Mr.Yuck] #2650122 04/29/19 09:24 AM 04/29/19 09:24 AM
Joined: Jan 2003 Posts: 1,643 A certified culture free zone. 74RALLYE OP top fuel
74RALLYE OP top fuel Joined: Jan 2003 Posts: 1,643 A certified culture free zone.	Hey Mr Yuck, Sorry for the snippy reply. I was having "one of those days"

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