1994 Cherokee , Electric Fan, 4.0L 2WD - JeepForum.com
 
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post #1 of 3 Old 12-24-2014, 12:29 PM Thread Starter
jmrec100
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1994 FSJ Cherokee 
 
Join Date: Oct 2012
Location: Wildomar
Posts: 13
1994 Cherokee , Electric Fan, 4.0L 2WD

Problem just started. I did have a radiator leak in lower corner. Had a radiator put in about 7 years ago. The shop must have lost the lower rubber mount where it leaked because it was missing when I pulled out the old radiator.. Guessing it bounced around and finally a bad leak.
Replaced the radiator. Replaced the hoses, some heater hoses . Did just fine. Then started to overheat a couple days later. The electric fan wasn't turning on when near overheating. I have a manual switch in the hood to turn it on during smog time. I pulled out the electric fan. Fan turned on fine. Reinstalled and it was working. I was thinking when I put it back in from the radiator replacement, I tweaked it. Hooked the regular connection. And it was fine. Until yesterday. Wasn't turning on. Turned on the switch and fan working.
So I'm thinking something controlling the fan isn't working. Or the fan is an intermittent problem. What controls the electric fan? Is it a temperature sensor. then to a relay?
What should I check and how?

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post #2 of 3 Old 01-18-2015, 01:15 PM
OldNewJeeper
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1999 XJ Cherokee 
 
Join Date: Nov 2012
Location: Saint Louis
Posts: 93
Garage
Weird radiator fan issue.

Sorry posted to wrong spot.
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post #3 of 3 Old 01-18-2015, 08:22 PM
Pcolt98
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1998 XJ Cherokee 
 
Join Date: Mar 2014
Location: Orlando
Posts: 196
Did you replace the stat when you changed the radiator?

Do you have a mechanical fan with a clutch?
If the clutch is bad, it could over heat at slow speed or standing.

The ECU controls the relay for the fan. The ECU decides when to turn the fan on in regard to its inputs like A/C and engine temperature.
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