Electric fan Help!
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
easy gauge fix
take this sensor and your temp sender and get a tee that goes between where this sensor is mounted and bush the tee down so both sensors can be used here.
Member
Joined: Apr 2010
Posts: 150
Likes: 2
From: Marion, IN
Year: 2001
Model: Cherokee
Engine: 4.0
I hope this doesnt constitute a thread hi-jack (famous last words). Anyway, My Efan has never kicked on to my knowledge in the 2 months I've owned my new XJ. The jeep warms up to one tick before 210- and stays there with nice steady driving. The condenser kicks on and off with the AC setting on. From what I've read on this thread I figure that i may have to wait until it warms up to see if it works because it's never reached 219 degrees, and because the condenser is only on for a few seconds at a time (its 10 degrees outside). Is this right?
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
yes thats working right now if it gets hot and never comes on the sensor that controls the fan needs to be checked
Thread Starter
Newbie
Joined: Dec 2010
Posts: 14
Likes: 0
Model: Cherokee
Yup thats where it was on the old head. I think I read somewhere that on the 98 they did away with the temp sender in the head so I guess thats why it's not there. I will get crackin on installing a T- junction in the T-housing for both sensors. Can I use the temp gauge in my dash or do I need an after market gauge? Great idea!
Thanks!!!
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
use all the stuff from the 96 head and gauge jus you might have to make the wire longer or reroute it so it reaches the front of the motor good luck
Member
Joined: Nov 2009
Posts: 198
Likes: 0
From: Fallbrook, CA (Commufornia)
Year: 2001
Model: Cherokee
Engine: 4.0
Yup thats where it was on the old head. I think I read somewhere that on the 98 they did away with the temp sender in the head so I guess thats why it's not there. I will get crackin on installing a T- junction in the T-housing for both sensors. Can I use the temp gauge in my dash or do I need an after market gauge? Great idea! Thanks!!!
Thanks!!!
Junior Member
Joined: Jan 2011
Posts: 86
Likes: 0
From: Tampa, FL
Year: 2001
Model: Cherokee
Engine: 4.0
I had the same problem with my 01. I tried several of the solutions already listed but none of it worked. So I just wired my fan to a switch in the cab and now when it starts to get hot I turn it on maunally. Works great for stop and go traffic and while on the trails in Ocala National Forest
Member
Joined: Nov 2009
Posts: 198
Likes: 0
From: Fallbrook, CA (Commufornia)
Year: 2001
Model: Cherokee
Engine: 4.0
I had the same problem with my 01. I tried several of the solutions already listed but none of it worked. So I just wired my fan to a switch in the cab and now when it starts to get hot I turn it on maunally. Works great for stop and go traffic and while on the trails in Ocala National Forest
Seasoned Member
Joined: Dec 2010
Posts: 345
Likes: 1
From: So. California
Year: 1991
Model: Cherokee
Engine: 4.0 HO
These companies that are manufacturing these electric fan kits make these adjustable thermostatic switches. Shoot, mount one of those in the cab and then you can adjust when the fan comes on at the turn of a dial. Then you won't have to be worried about watching the gauges every minute.
Thread Starter
Newbie
Joined: Dec 2010
Posts: 14
Likes: 0
Model: Cherokee
So here is an update. I installed the brass T- junction in the T-housing placing both sensors in the T- juction. That would be the temp sender/sensor and the ECU temp fan sensor . The sender sensor is not giving me a good reading it only gets up to about 160 degrees. I used a thermal scanner to take a temp reading at the T-housing and it read 220 degrees. The E- fan never turned on even thou it will run when I unplug the connector from the original T-housing temp sensor. I did replace the temp sensor for the fan. Could somethoing in my A/C system be causing this problem? The a/c unit does not work and when I turn it on I dont hear any change in the engine or the compressor kicking in but it stop working years ago. I am at a lost. some one else suggested the low pressure switch on the A/C accumalator but I dont see that connection on mine.
Member
Joined: Nov 2010
Posts: 239
Likes: 0
From: Tooele, Utah
Year: 1998
Model: Cherokee
Engine: 4.0
Ok check this out and see if this works. In your PDC under the hood you have your cooling fan relay. Pull out the relay and figure out what side of the relay is suppose to be grounded. Get a wire, strip it back and put your relay back in. Then ground the wire and see if your fan kicks on. It should since you said if you unplug the connector it will kick on. If this kicks it on the measure the ohms on the wire that goes from there to your ECM. Should be DK Blu/Pink. If this has low resistance on it but still a complete circuit move to the coolant temp sensor wires. Make sure your Blk/Tan wire from the temp sensor back to the ECM is complete with low resistance. A high resistance might make your computer think the guage is still within range when it is not. Also there are 3 different grounds on your ECM. MAKE SURE THESE ARE GOOD. It is possible that one of the grounds that end up grouding this circuit is bad. So even though the computer is trying to ground the relay it is not getting grounded through the ECM. I would actually start at the ECM and make sure all the grounds are good first.
Senior Member
Joined: Jun 2009
Posts: 670
Likes: 0
From: Central Pennsylvania
Year: 1989
Model: Cherokee (XJ)
Engine: 4.7 H.O.
Alright so I got my new head installed and my cherokee started up and is running. Now I need help with the next issue. The electric fan does not turn on even when I switch the A/C on. I checked my ground to the aux fan relay it was good. I placed a fused jumper in the relay position pins 1 and 4 and the fan started running. After that I put the old relay back in and unplugged the temp sensor in the T-Housing and the fan started running.When I plugged the the sensor back in it stoped. I went to buy a new sensor from the dealer but the one they said fits my 1996 Jeep Cherokee does not fit the connector. Instead the sensor for a 1998 Cherokee does. So I had no choice but to take the one for the 1998. I even gave one dealer my vin number and it still called out for the wrong sensor. I had the 1998 style sensor in there before when the fan was working.So to sum this up. I have a 1996 Jeep Cherokee Sport with 4.0l. The electric fan is not working even with the A/C on. I installed a new Temp sensor in T-Housing. The fan only works if I jumper the relay connector or unplug the temp sensor. Does anyone have any idea what could be wrong?
I don't mean to say this like I am 100% right, perhaps my 96 isn't working right either, but since I have a 96 I figured I would share my experience.
Another easy fix, run a toggle switch to it, it's easy enough to get to, then you can turn it on as you feel it needs to be on. I have done that on several other cars I had, just haven't needed to on my Jeep.
Last edited by sv41878; Jan 27, 2011 at 04:54 PM.
Senior Member
Joined: Jun 2009
Posts: 670
Likes: 0
From: Central Pennsylvania
Year: 1989
Model: Cherokee (XJ)
Engine: 4.7 H.O.
The sending unit to the temp sensor is on the side of the head, drivers side on a 96 and may give a different temp than you get from the temp at the t stat housing as the back of the head is where the coolant comes into the head, the t stat is where it is coming out, after it has cooled everything down. The sender in the t stat housing is only for the fan. They are no interconnected. I know this as a fact, I just checked the factory repair manual to confirm it.
Member
Joined: Nov 2009
Posts: 198
Likes: 0
From: Fallbrook, CA (Commufornia)
Year: 2001
Model: Cherokee
Engine: 4.0
So here is an update. I installed the brass T- junction in the T-housing placing both sensors in the T- juction. That would be the temp sender/sensor and the ECU temp fan sensor . The sender sensor is not giving me a good reading it only gets up to about 160 degrees. I used a thermal scanner to take a temp reading at the T-housing and it read 220 degrees. The E- fan never turned on even thou it will run when I unplug the connector from the original T-housing temp sensor. I did replace the temp sensor for the fan. Could somethoing in my A/C system be causing this problem? The a/c unit does not work and when I turn it on I dont hear any change in the engine or the compressor kicking in but it stop working years ago. I am at a lost. some one else suggested the low pressure switch on the A/C accumalator but I dont see that connection on mine.
http://www.summitracing.com/search/b.../?autoview=SKU
Member
Joined: Nov 2010
Posts: 239
Likes: 0
From: Tooele, Utah
Year: 1998
Model: Cherokee
Engine: 4.0
He said his thermostat housing read 220 with a non contact thermometer so it might be getting that hot. My question is though why isn't your mechanical fan keeping it cool enough? Are you sure that is working right?