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Unread 10-12-2009, 08:07 PM   #1
daufuskieraised
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Blower fan stays on after turning off Jeep

So I just had to get a jump because my mom left the power inverter turned on while we were in Chili's at dinner. But she arose the question, why does the AC/Heat blower fan stay on even after the Jeep is shut off? If I have it on while the Jeep is on, and turn the Jeep off, it stays on until I turn the dial to off. But if I turn the dial back on while the Jeep is still off it doesn't come back on. Is this normal? She is trying to blame the dead battery on that instead of the power inverter but I have never noticed the fan staying on after the Jeep is off.

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Unread 10-12-2009, 11:22 PM   #2
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I can tell you it's not normal, but I'm kind of at a loss as to what's causing it. Perhaps a bad relay? I'm not sure where the relay for the blower is though. It might require pulling the trim piece off that surrounds the area the cover piece is for the fusebox. I think the relays are above that. It also could be as simple as the climate control going bad. I honestly would think power would be lost to the climate control so it'd not do anything once the vehicle is off. I hope some others will chime in here because this is very curious, and now I'm wondering.
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Unread 10-12-2009, 11:36 PM   #3
the88thpianoman
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Could be the blower motor resistor, though usually that will just stay on high regardless of what you do. I would think it has to be either the resistor, or the actual AC control panel.
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Unread 10-12-2009, 11:39 PM   #4
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Quote:
Originally Posted by the88thpianoman View Post
Could be the blower motor resistor, though usually that will just stay on high regardless of what you do. I would think it has to be either the resistor, or the actual AC control panel.
Resistor. Duh. That's what I was thinking of, but of course it wouldn't come to my hobbled little mind. That sounds just like the resistor to me. I don't think the control has anything to do with the blower still going or not while the power to the vehicle is off, but that'd be worth checking as well.

Time for bed for me. Relay, resistor. They both start with the same letter. I just completely steered myself and dauf in the wrong direction...
Apologies.
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Unread 10-13-2009, 12:11 AM   #5
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I'd focus on the hvac head unit or the relay in the power distribution center.
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Unread 10-13-2009, 07:59 AM   #6
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Nevermind the blower resistor if the fan still works at all speeds. That's it's only job.

If the fan stays on when the ignition is turned off I would investigate the ignition cylinder itself. Never had the problem myself but had read about it in the past. (And odds are I would have read it here or at wjjeeps.com so a search should bring it up).





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Unread 10-13-2009, 09:11 AM   #7
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Thanks for the answers y'all. I'm gonna make sure the battery is charged and clean the terminals and go from there. We all know how the battery can be.
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Unread 10-13-2009, 09:15 AM   #8
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My fan stays on until I turn the headlights off....I tell my girlfriend that it's because I'm a magician and can control the earth along with my fan.
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Unread 10-13-2009, 10:09 AM   #9
daufuskieraised
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Quote:
Originally Posted by Bannonjr View Post
My fan stays on until I turn the headlights off....I tell my girlfriend that it's because I'm a magician and can control the earth along with my fan.
Oh that would make sense because I leave my lights on automatic. I'm gonna try that for sure today. I hope I'm a magician too!
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Unread 10-13-2009, 11:29 AM   #10
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Craaazy. I wonder what kind of electrical gizmo doohickey's going on the fritz to cause that. I always leave my headlights on automatic and never have this issue. I have my own list of electrical gremlins, but still.
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Unread 10-14-2009, 05:10 PM   #11
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Well just an update. It stopped. So maybe it was just being weird because the battery went dead.thanks for help y'all.
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Unread 09-12-2010, 11:02 PM   #12
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an old thread but.... Mine was doing something pretty simular. the blower would stay on even after i turned the car off or even if i turned it off at the dash. my fan speed worked so this is where it tricked me for awhile. I could adjust the speed and everything so i wasnt thinking the resistor but i unplugged it from under the dash and then it would turn off when it was suppose to but now only worked on high

So i need to replace the resistor and should work perfect

Last edited by Ganjatrooper; 09-13-2010 at 02:21 AM.. Reason: jumped the gun and added that i already replaced the resistor.
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Unread 09-13-2010, 06:39 AM   #13
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Quote:
Originally Posted by Ganjatrooper View Post
an old thread but.... Mine was doing something pretty simular. the blower would stay on even after i turned the car off or even if i turned it off at the dash. my fan speed worked so this is where it tricked me for awhile. I could adjust the speed and everything so i wasnt thinking the resistor but i unplugged it from under the dash and then it would turn off when it was suppose to but now only worked on high

So i need to replace the resistor and should work perfect
Defective resistors usually prevent the blower from operating rather than making it operate when it should be off.

Is your HVAC system the Automatic Temperature Control version?
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Unread 03-16-2011, 03:52 PM   #14
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So I'm hoping that someone is still looking at this thread. I have a '99 JGC and the blower will not shut off!. When I first bought the Jeep the blower would work intermittantly (but never stay on). I found that the Resistor was melted and it had wires showing. I bought and installed a new resistor and the system then started blowing the blower motor fuse under the hood. I took it my local dealer and......they called me and said they replaced the fuse and everything worked great! Perfect, I picked up the Jeep and the next morning I came outside only to find the blower motor running with no keys in the ignition! Took the car back to the dealer and they called back later that day saying the head control unit needed to be replaced (for $750)! after some research I was not convinced this was the issue. I replaced the head control unit with a used one (that came out of a working Jeep) and the same exact issue occurs!

So, has anyone resolved this issue? Did it wind up being the ignition cylinder? I also see mention of a relay, but can't seem to located a relay that affects the blower motor.

I should also note that my Jeep has Automatic Climate Control.

Any advise would be greatly appreciated.

Last edited by jmhouse; 03-16-2011 at 04:12 PM..
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Unread 03-21-2011, 10:38 AM   #15
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Blower fan stays on even with key out

I have a 94 grand Cherokee, it was sitting for two years as I got it free and it needed a trans. I put the trans in it in the fall fixed the fuel lines that the mice chewed through and vacuumed the nest out of the blower itself. I didn't see any other damage from mice. I've only put a couple hundred miles on it so far and every thing was working fine.

Yesterday I was driving down the road and the blower fan kicked up to high by itself even though the dial was turned to about quarter speed. the digital screen flashed "ER" for a second. The Temperature control still works but the fan speed control does not, and if i turn the climate control off the fan stays on, if I turn the truck off and take the key out the fan stays on. the only thing i can do is turn the climate control to Auto and the fan will respond to HI or Low.

Any Ideas? I guess I'll try to check the relay first. I'm putting a full charge on the battery now, as I left the glove box light on the other night, so the battery may be weak. but it started on its own and i drove nearly 30 miles before the malfunction started.
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