WJ Grand Cherokee cooling electric fan stays on all the time - JeepForum.com
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Unread 08-19-2007, 11:26 AM   #1
dragginwagon406
Registered User
1998 TJ Wrangler 
 
Join Date: Jul 2006
Location: Northwest Ohio
Posts: 1,277
WJ Grand Cherokee cooling electric fan stays on all the time

As the title says, we arrived home late last night, shut off the engine and the electric fan was still running. Seeing as it was only 55° outside and the fan never runs after the engine is off, I immediately pull the fuse for the fan and call it a night.

So after some time on google, I find the most likely cause is a bad fan relay Sorenson Part # 41-5330 and I find a good website showing where it is and how to gain easy access.

http://www.carspace.com/billnick/Alb...%20Relay%20Re/

So I replace the the relay and test the system by starting the engine and turning on the A/C and within a few moments the fan turns on.

But what I find strange is how hot the relay gets so quickly up to about 120° F in about 10 minutes. I did notice the relay is built on a heat sink which would indicate high temperature is normal but I would really like to test the fan for current draw.

Does anyone know what the correct current draw on the fan? The fuse is a 40 A but that should be to cover the startup current which is significantly higher.

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Unread 08-19-2007, 12:30 PM   #2
indept
Registered User
2000 WJ 
 
Join Date: Aug 2007
Location: New Jersey
Posts: 1,306
I had a problem with the fan not working. I found it was a burnt contact in the relay connector. I bought a connector fix kit at the dealer. I also noticed how hot it got so when I cut the old connector off to fix it I added a couple feet of heavy gauge wire and relocated the relay just behind the grill in front of the ac condenser. I got an old pentium II heatsink ( it was the perfect size & had a lot of cooling fins), mounted the relay to the heatsink & mounted it upside down in front of the condenser so the heatsink fins were facing up into the airflow. I painted it black to blend in. Now the relay runs cool to the touch. It's a solid state relay so the cooler you keep it the better especially at 75 bucks a pop.
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