Overheating Issue
Member
Joined: Jun 2016
Posts: 194
Likes: 0
From: South Texas
Year: 2000
Model: Cherokee
Engine: 4.0
Fwiw, my xj would do this when my aux fan quit coming on automatically.
how it should work: thermostat is normally 195
aux fan should auto kick on at something like ~227 I want to say from memory. and not turn off until below 215. or when A/c is turned on.
For me I just put mine on a switch/relay instead of troubleshooting it. Mine comes on with a/c but not automatically as it should when a/c is off. Tried a mopar coolant temp sensor and didn't fix it. So like i said I just hard wired it and haven't had an issue.
Mine would get hot around 220-235 after it was good and warm (20-30mins of run time) and then sitting in traffic. Knowing my cooling system was fresh....I Tried 2 stats and 2 fan clutches and the zj napa clutch. and the aux fan is what ended up fixing it for me.. I just flip the switch on anytime I'm not on the highway. I can sit in traffic with a/c on for an hour now and temp never climbs
It took me awhile to concede that the aux fan was mandatory for keeping my xj cool but It works for me and might work for you..
how it should work: thermostat is normally 195
aux fan should auto kick on at something like ~227 I want to say from memory. and not turn off until below 215. or when A/c is turned on.
For me I just put mine on a switch/relay instead of troubleshooting it. Mine comes on with a/c but not automatically as it should when a/c is off. Tried a mopar coolant temp sensor and didn't fix it. So like i said I just hard wired it and haven't had an issue.
Mine would get hot around 220-235 after it was good and warm (20-30mins of run time) and then sitting in traffic. Knowing my cooling system was fresh....I Tried 2 stats and 2 fan clutches and the zj napa clutch. and the aux fan is what ended up fixing it for me.. I just flip the switch on anytime I'm not on the highway. I can sit in traffic with a/c on for an hour now and temp never climbs
It took me awhile to concede that the aux fan was mandatory for keeping my xj cool but It works for me and might work for you..
My Aux Fan always turns on, even before reaching 210. of course thats with A/C on. but I doubt the engine should ever get that hot, even without an Aux Fan. Something is wrong with an XJ if it gets that HOT Aux fan or no Aux fan.
Beach Bum
Joined: Jul 2011
Posts: 6,123
Likes: 22
From: Cape Hatteras, North Carolina
Year: 2000 WJ
Model: Grand Cherokee
Engine: 4.0
Mine would get hot around 220-235 after it was good and warm (20-30mins of run time) and then sitting in traffic. Knowing my cooling system was fresh....I Tried 2 stats and 2 fan clutches and the zj napa clutch. and the aux fan is what ended up fixing it for me.. I just flip the switch on anytime I'm not on the highway. I can sit in traffic with a/c on for an hour now and temp never climbs
It took me awhile to concede that the aux fan was mandatory for keeping my xj cool but It works for me and might work for you..
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 83
Likes: 0
From: Louisville, KY
Model: Cherokee
Engine: 4.0
Thanks to all who have responded. Im currently running some of that Prestone radiator flush with distilled water. I have used it before with good success but never for fixing a cooling problem. If after the flush, I'm still overheating I'll do the water pump. I'll also be getting a coolant test soon.
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 83
Likes: 0
From: Louisville, KY
Model: Cherokee
Engine: 4.0
Fwiw, my xj would do this when my aux fan quit coming on automatically.
how it should work: thermostat is normally 195
aux fan should auto kick on at something like ~227 I want to say from memory. and not turn off until below 215. or when A/c is turned on.
For me I just put mine on a switch/relay instead of troubleshooting it. Mine comes on with a/c but not automatically as it should when a/c is off. Tried a mopar coolant temp sensor and didn't fix it. So like i said I just hard wired it and haven't had an issue.
Mine would get hot around 220-235 after it was good and warm (20-30mins of run time) and then sitting in traffic. Knowing my cooling system was fresh....I Tried 2 stats and 2 fan clutches and the zj napa clutch. and the aux fan is what ended up fixing it for me.. I just flip the switch on anytime I'm not on the highway. I can sit in traffic with a/c on for an hour now and temp never climbs
It took me awhile to concede that the aux fan was mandatory for keeping my xj cool but It works for me and might work for you..
how it should work: thermostat is normally 195
aux fan should auto kick on at something like ~227 I want to say from memory. and not turn off until below 215. or when A/c is turned on.
For me I just put mine on a switch/relay instead of troubleshooting it. Mine comes on with a/c but not automatically as it should when a/c is off. Tried a mopar coolant temp sensor and didn't fix it. So like i said I just hard wired it and haven't had an issue.
Mine would get hot around 220-235 after it was good and warm (20-30mins of run time) and then sitting in traffic. Knowing my cooling system was fresh....I Tried 2 stats and 2 fan clutches and the zj napa clutch. and the aux fan is what ended up fixing it for me.. I just flip the switch on anytime I'm not on the highway. I can sit in traffic with a/c on for an hour now and temp never climbs
It took me awhile to concede that the aux fan was mandatory for keeping my xj cool but It works for me and might work for you..
Thread
Thread Starter
Forum
Replies
Last Post
Belto
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
22
May 1, 2020 03:46 PM
Eric Suchomski
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
20
Jun 9, 2016 07:13 PM
jgitsme
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
7
Apr 20, 2016 12:42 PM
mattypat
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
9
Aug 6, 2008 01:00 AM
nad
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
May 2, 2008 05:36 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)