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Engine Fan Doesn't Start


 
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egohavoc
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Joined: 30 Jul 2006
Location: Orlando, FL

PostPosted: Fri Apr 06, 2007 4:57 pm    Post subject: Engine Fan Doesn't Start Reply with quote

Hey.. just a general question... sort of.


Grand Cherokee (99) Laredo
For the past week or so my engine has been over-heating when I'm stopped in traffic (or a drive-thru).

I replaced the thermostat tonight.. let it sit for a few minutes and it still over-heated. Upon further inspection we noticed that fan wasn't firing. We hooked it up directly to the battery and it WORKS... it just doesn't fire up when it idles...

Does anybody have any ideas why this might happen or should I just have a shop trouble shoot it?
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egohavoc
Member


Joined: 30 Jul 2006
Location: Orlando, FL

PostPosted: Fri Apr 06, 2007 7:11 pm    Post subject: Reply with quote

Upon further inspection (and I've found this question has gone unanswered in this forum before)

The thermal switch or cooling fan relay or fan clutch appears to have gone bad. I keep finding varied information about the years/models of vehicles so I'm trying to sort out the right thing. I BELIEVE it is the cooling fan relay.

Looking up specs on how to fix this.. will probably edit this post later.

*edit*

So if this is my fan relay.. how do I replace it?

*edit #2*
It is most likely the fan relay. The relay is located underneath the right headlight.. behind the bumper. To replace you have to either take the bumper off or cut a hole in the plastic above the headlight.

Three sites of reference...
Solution
Replacement Instructions
Replacement Instructions w/ Image

I answered my own question.. but hopefully I answered somebody elses as well.
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Sat Apr 07, 2007 7:28 pm    Post subject: Reply with quote

wow thats a stupid place to put a relay . to replace it go find it and unplug it and put in a new one . it might be the same relay as one of your other ones .

check the number if its the same as say your fuel pump relay put it in there and see if your fuel pump works , ive noticed on my xj all the relays are the same so im guessing your might be just read the numbers on the side.

there is no way you can sneak your hand in there to replace it ? have you done it yet , was it the problem ?
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SnaFu2
Member


Joined: 01 Apr 2006
Location: Middletown, N.J.

PostPosted: Thu Apr 26, 2007 2:58 am    Post subject: Reply with quote

I believe that there is a write-up with pictures on JU.
Find it hard to understand why anyone would put a relay behind
the headlights, quess it is a jeep thing.
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egohavoc
Member


Joined: 30 Jul 2006
Location: Orlando, FL

PostPosted: Thu Apr 26, 2007 12:18 pm    Post subject: Reply with quote

Hey guys,

Yes, that was the problem all right. Stupid relay was $65 at AutoZone.. but apparently the previous owner to my car had already replaced the relay because there was already a hole cut under my headlight. Made the change easy. Wound up doing a radiator flush that day too. The relay was def. shot though.. Operation successful.
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