problem with radiator fan please help

[chris90]

Hi my girlfriend has an 04 with the 3.7l without the heavy duty cooling..just has a single radiator fan.. the fan only comes on when the a/c has been switched on..all other times it will just over heat and the fan never comes on if it sits for long enough..the temperature gauge seems to be working properly and the radiator and thermostat have recently been replaced..I even plugged up a new fan and it does the same thing..no wires appear to be messed up or anything..what could be the problem?

 

[02blue]

I got a CEL when my fan relay went a couple years ago. Did it in traffic and overheated very quickly. I didn't try my AC at the time to see if that would still run the fan so not sure this is the same as your situation. I think the relay was access through the driver side wheel well if my memory correct.

 

[John3seventeen]

Hi my girlfriend has an 04 with the 3.7l without the heavy duty cooling..just has a single radiator fan.. the fan only comes on when the a/c has been switched on..all other times it will just over heat and the fan never comes on if it sits for long enough..the temperature gauge seems to be working properly and the radiator and thermostat have recently been replaced..I even plugged up a new fan and it does the same thing..no wires appear to be messed up or anything..what could be the problem?

There is a fan relay on the drivers side inner fender well that goes bad. But sorry I cant find my picture of it.

 

[chris90]

There is a fan relay on the drivers side inner fender well that goes bad. But sorry I cant find my picture of it.

I switched it with ac blower motor relay which was definately working and it didn't do anything

 

[02blue]

Are the wires to and from that relay ok?

 

[02blue]

Not sure we're talking about the same relay:

More Information for AIRTEX / WELLS 1R2144

 

[John3seventeen]

I switched it with ac blower motor relay which was definately working and it didn't do anything

It's not the relays in the fuse box its a large - approx 3"x4" mounted on the inner fender well down low near radiator and beneath the battery box.

 

[chris90]

It's not the relays in the fuse box its a large - approx 3"x4" mounted on the inner fender well down low near radiator and beneath the battery box.

I was unaware of this thankyou..is there any easy way to identify if this one is the problem

 

[John3seventeen]

I was unaware of this thankyou..is there any easy way to identify if this one is the problem

Here is a pic of an aftermarket one with cooling fins that I installed. (Behind the hoses). If I recall correctly the factory one doesnt have cooling fins.

You must be registered for see images

 

[JeepJeepster]

Purdy sure the 04's do NOT have that. Mine doesnt at least. Not sure how my fan works.

 

[John3seventeen]

Well that just changes the ball game doesnt it! Sorry

Maybe this wil help - http://www.justanswer.com/jeep/6zzxy-jeep-liberty-limited-problem-radiator-fan-04-jeep-liberty.html

 

[chris90]

Purdy sure the 04's do NOT have that. Mine doesnt at least. Not sure how my fan works.

Idk its not here atm for me to check but I didn't notice it when I followed the wires or when I put in the new radiator.

 

[02blue]

Picture of 04 relay:
More Information for STANDARD MOTOR PRODUCTS RY115

Doesn't look equivalent to the AC relay.

Thread from John317 looks very helpful!

 

[chris90]

Yes thankyou I actually did see that thread already..i did figure out the fan does work but it only decides to come on if the ac is switched on..but I'm confused now though. I'm wondering now if there is in fact annother relay for the fan other than the one in the fuse box or not

 

[chris90]

The blower motor relay and the fan relays in the fuse box have the same part number so that's why I switched them around to see if it made a difference since they r the same

 

[John3seventeen]

When reading that piece I noticed it said there is a high and low speed relay.

 

[02blue]

The picture of the fan relay has a bolt hole so assuming it's not in the relay/fuse box. I'm leaning toward the fan being defective. Sounds like you lost one speed as per the thread. I'd run it with the AC on if that gets the fan going. You don't want to overheat that motor. Trust me I know from experience.

 

[chris90]

The picture of the fan relay has a bolt hole so assuming it's not in the relay/fuse box. I'm leaning toward the fan being defective. Sounds like you lost one speed as per the thread. I'd run it with the AC on if that gets the fan going. You don't want to overheat that motor. Trust me I know from experience.[/QUOTE
Way past that point..replaced radiator cause it cracked when she let it overheat...but like I said I already tried a new fan and it does the same thing let it sit and run for a while with the nnew fan and it would not click on unless the ac was on

 

[chris90]

Yes there is a low and high I tried switching them both out it didn't do anything

 

[02blue]

Forgot you mentioned trying the other fan.

You may have been lucky with just the rad. I cooked my headgasket(s). My relay went in traffic, pulled over ASAP and never even red lined the temp. Immediately had a milkshake in the crankcase.

Maybe need to track down the possibility of a remote relay.