electric fan always on
05-10-2012 | 04:45 AM
#18
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Newbie
Joined: Apr 2012
Posts: 21
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From: Oregon
Year: 1989
Model: Cherokee
Engine: 4.0
05-10-2012 | 05:35 AM
#19
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 31
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Alright so I took out the paper clip rig and plugged the temp sensor back in. Been driving it in 75-80 degree weather in town with no problems. Fan no longer runs until temp gauge says about 200. I'm guessing my temp gauge is off and its really 210 when its kicking on, but either way, not overheating, running pretty good.
About the only thing I would complain about, is after getting the fan working properly I took it out on the gravel roads and well "jeep" roads to make sure it didn't overheat in extreme conditions, it never got close to overheating, but every once in a while when I would come to a stop it would high idle, around 1500-2000rpm, didn't matter weather I was in gear or if I put it in neutral, it would stay high idle. It would only last 10-20 seconds, but its not right...
I've replaced both ccv hoses coming off valve cover...inside the valve cover had lots of gunk
, or at least where the hoses went through. Other than the high idle issue (really only happened in the woods...seemed mostly after climbing up hill for awhile...??) it been running good.
About the only thing I would complain about, is after getting the fan working properly I took it out on the gravel roads and well "jeep" roads to make sure it didn't overheat in extreme conditions, it never got close to overheating, but every once in a while when I would come to a stop it would high idle, around 1500-2000rpm, didn't matter weather I was in gear or if I put it in neutral, it would stay high idle. It would only last 10-20 seconds, but its not right...
I've replaced both ccv hoses coming off valve cover...inside the valve cover had lots of gunk
, or at least where the hoses went through. Other than the high idle issue (really only happened in the woods...seemed mostly after climbing up hill for awhile...??) it been running good.
05-10-2012 | 10:31 PM
#21
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Newbie
Joined: Apr 2012
Posts: 21
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From: Oregon
Year: 1989
Model: Cherokee
Engine: 4.0
I will work on it this weekend and report back. Figure I should probably clean the iac anyways, then if problem continues I'll go to the tps.
Thanks again, I'll report back after the weekend
Thanks again, I'll report back after the weekend
05-11-2012 | 02:01 AM
#22
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Joined: Mar 2012
Posts: 122
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From: Plaza, ND ..... Unfortunately
Year: 1992
Model: Cherokee
Engine: 4.0 I6
The previous owner must have had a problem with the fan not turning on or an oveheating problem. The temp sensor for your fan might be bad but I'd just cut the hot wire to your fan and run a switch and a relay to it so you can turn your fan on when you want to.... Just keep wise of your temp and don't let it get above about 210ish before you turn on the fan. For some reason my 88 runs at a constant 180 no matter if it's Floored or idling. I think the old owner took out my thermostat cuz I have blue rtv on my water inlet/outlet when there should be a gasket. Oh well I'm not complaining.
05-12-2012 | 12:49 PM
#23
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Newbie
Joined: Apr 2012
Posts: 21
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From: Oregon
Year: 1989
Model: Cherokee
Engine: 4.0
The previous owner must have had a problem with the fan not turning on or an oveheating problem. The temp sensor for your fan might be bad but I'd just cut the hot wire to your fan and run a switch and a relay to it so you can turn your fan on when you want to.... Just keep wise of your temp and don't let it get above about 210ish before you turn on the fan. For some reason my 88 runs at a constant 180 no matter if it's Floored or idling. I think the old owner took out my thermostat cuz I have blue rtv on my water inlet/outlet when there should be a gasket. Oh well I'm not complaining.
Yes, most likely there was a reason the fan was wired on, but this could have been before the po I bought it from (he might have bought it with bad pressure bottle and rigged fan), then the po I bought from did pressure bottle and flush, maybe just didn't know to unrig the fan. Either way, I'm over the fan issue for now unless it tries to overheat which is not happening at all.
05-12-2012 | 01:08 PM
#25
Senior Member
Joined: Aug 2011
Posts: 690
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From: Pennsylvania
Year: 1988
Model: Cherokee
Engine: 4.0
Your rigged issue is going to be my salvation. lol. I need to see if my electrical fan work, because it does not run, at all, and thanks to your thread, I can kind of go backwards from where you are at to solve it, so thanks. These threads often help somebody in a completely differant boat.
05-12-2012 | 01:48 PM
#26
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Newbie
Joined: Apr 2012
Posts: 21
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From: Oregon
Year: 1989
Model: Cherokee
Engine: 4.0
Glad to hear its helping someone else. Just use the paperclip trick to see if your fan is working. Unplug harness in picture and rig like shown Haha, it should turn on as soon as you turn the key before it even cranks over.
As for my idle issue, I'm pretty sure its going to be that idle air control valve, but not sure yet
Just under 200 degrees is where mine runs now too (according to my stock gauge anyways)
My fan kicks on before my gauge says 210...not sure if my gauge is off or what, but not too worried about it.
As far as not having a thermostat, that's bad, and they are cheap, I think you want a 195 degree. Although...the blue gasket maker around your thermostat housing could be from po changing thermostat, may not need a new one. If its running cool and doesn't like to warm up, then you may be missing the thermostat. Either way, easy to find out. Pull it out (if there is one) and see if its stuck open, ****, or if sticky when compressed.
As for my idle issue, I'm pretty sure its going to be that idle air control valve, but not sure yet
Just under 200 degrees is where mine runs now too (according to my stock gauge anyways)
My fan kicks on before my gauge says 210...not sure if my gauge is off or what, but not too worried about it.
As far as not having a thermostat, that's bad, and they are cheap, I think you want a 195 degree. Although...the blue gasket maker around your thermostat housing could be from po changing thermostat, may not need a new one. If its running cool and doesn't like to warm up, then you may be missing the thermostat. Either way, easy to find out. Pull it out (if there is one) and see if its stuck open, ****, or if sticky when compressed.
Last edited by strokerspeed; 05-12-2012 at 01:58 PM.
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