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Unread Yesterday, 02:51 AM   #1
PaulOdendaal
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Join Date: Oct 2014
Posts: 6
Jeep Libert Electric cooling fan problem

Hello I have a KJ liberty 2005 2.8CRD The problem I am having is as follows
The car started over heating I found the electric fan was seized. I have replaced the fan it is now working. Here is the problem with both the hi and low relays in place the fan does not come on with the aircon, the temp then get up to 3/4 on the gauge but drops quickly. I am assuming the hi speed is kicking in. however if I remove either of the relays then the fan starts running permanently, and the temp gauge stays just below 1/2 way which is where it used to sit normally. What will be the cause of the fan not running when switching the a/c on ? The a/c blows cold and the compressor is kicking in.


Last edited by PaulOdendaal; Yesterday at 02:56 AM.. Reason: add information
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Unread Yesterday, 03:40 PM   #2
mjuenem
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2005 KJ Liberty 
 
Join Date: Sep 2014
Location: Mahopac, NY
Posts: 21
Based on the electrical diagram I would suspect the AC Compressor Clutch Relay.
ac-fan.jpg  
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Unread Today, 12:24 AM   #3
PaulOdendaal
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Thanks will try this out this morning The wiring diagram helps
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Unread Today, 04:25 AM   #4
PaulOdendaal
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Hi Mjuenem sorted out thank you for the diagram the number 87 pin on the low speed relay in the fuse box was pushed down so not making contact a little push with a screw driver from behind and it clicked back into position and the fan started about 10 sec after I started the car with a/c on. PERFECT. I will say this these Jeep Liberty / Cherokee 2.8 CRD give some weird problems but most seem to be quite easily remedied I love this car and it never ceases to amaze with its capabilities.
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Unread Today, 04:56 AM   #5
Billwill
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2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
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That diagram is actually for the Gas engine not the Diesel......the diagrams are similar and in either case have nothing to do with the AC Clutch Relay.

In the case of the Gasser, the High Speed And Low Speed Relays get their Ground power from the PCM and in the case of the Diesel these relays get their ground power from the ECM. The ECM gets its commands in this case from the BCM which gets its commands from the A/C switch panel and also High Pressure Switch for the Diesels only.... if there are issues with the refrigerant pressure.

Anyhow the problem in this case was that the Low Speed Relay was unable to send its +12 volt output to the Radiator Fan Motor due to its female pin being pushed back.

For future reference here is the circuit diagram for the relays for the Diesel....how the relays get their ground from the BCM or High Pressure Switch is pretty complicated though but here is also the location of the High Pressure Switch as well in case there are further problems.
img.jpg

img_0001.jpg

img_0002.jpg

__________________
2002 2.5 Export CRD Manual 5 speed.
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Unread Today, 05:51 AM   #6
PaulOdendaal
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I did realize it was the incorrect diagram but it was close enough to give me power flows I had tested the high pressure switch earlier by bridging the wires. It just took some testing with a multimeter and some patience to find the problem. what was confusing is that when you extract either the hi or low speed relays from the sockets the fan would run permanently till I realised that this was a fail safe so the car wont over heat due to a relay failure. Thank you for the correct diagram I have saved it to my pc for future reference.
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Unread Today, 06:07 AM   #7
mjuenem
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2005 KJ Liberty 
 
Join Date: Sep 2014
Location: Mahopac, NY
Posts: 21
Billwill, thanks for the correction. I knew it was the gas diagram but I figured it had to be close enough.
Mark
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