My 1999 jeep has the 4.0 6cyl with the electric cooling fan. I am currently stumped as to why the electric fan will not turn on. When I jumper 12v to the fan it operates fine. I just replaced the temp switch on the thermostat housing but that was no help as well. I found the fan relay in a compartment next to battery. I swapped the 40 amp radiator fan relay with the 40amp starter relay and this was no help. Is there more to the system that this. I am sure that this circuit goes through the engine computer but I am not getting any troublecodes. Any Ideas.

 

I would figure a broken wire or a relay, but if you switched it, I guess it's not a relay. I thought the fan relay was under the headlight separate from the rest tho. Or is that just in a Grand???? I know the Grand is under the right headlight. I always take out the headlight assembly and use a hole saw to get to it without doing major disassembly.

 

Sorry, I just saw you had a Grand Cherokee. Yes under the right headlight assm. below that plastic is the cooling fan relay

 

There are two relays. Mine blew the one under the hood, I got lucky with it.


The other is under the passenger headlight.
Fan relay writeup




Or the Temp sensor needs replaced.

 

Yup, that's what I'm talkin' about. Nice pic!!! Perfect.

 

But Why would they put the relay in such a out of the way place ! For cryin out loud!

 

I've always wondered why they would do a lot of that stuff too moses. In fact, that must be the fine Chrysler engineering. Long live AMC. LOL.

 

Designed by an engineer not a mechanic.

 

EXACTLY!!!!!!!

 

Last minute decision by an engineer on a Monday while still hungover.

 

Thanks everyone for your help. It was that relay. The relay I changed was the "radiator fan relay". Im not really sure what it is for but it obviously was not the problem.

 

Shouldn't this thread be in the GC chat area since most of us don't have grands here?

Moderators wake up and smell the coffee.

 

lol are those mods sleeping again geesh they need to earn their pay.. I have been wondering why this was still in here..

 

Where's the relay under the hood in the Grand Cherokee?

 

Moved to GC Tech.