Overland 5.7 radiator fan not working - JeepForum.com
 
LinkBack Thread Tools
post #1 of 8 Old 07-24-2019, 12:54 PM Thread Starter
Pculvert
Registered User
 
Join Date: Jul 2019
Posts: 2
Overland 5.7 radiator fan not working

I have a 2014 GC overland with the 5.7 and tow package, and noticed my radiator fan isn’t turning on when temp gets to high or when ac is turned on, fan was replaced about 3-4 months ago so still under warranty, went ahead and swapped it out and still isn’t working, checked the fuses and k11 relay, I have power and ground and the fan connector, what kind of signal come from the small 3rd wire? Is it + or - and where does that signal come from? Wanted to be able to hook up leads directly to fan but don’t know what to add to small signal wire I’m guessing, any help is appreciated
Thanks

Pculvert is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 07-24-2019, 01:46 PM
ColdCase
My Reality Check Bounced
 
ColdCase's Avatar
2011 WK 
 
Join Date: Sep 2009
Location: New England
Posts: 15,536
The HD fan that comes with the tow package and 5.7 is PWM driven by the TIPM. There are relays in the TIPM that are not used (those are used for the SD two speed fan). The PCM varies the 12VDC pulse width to speed or slow the fan. There is a diagram around here someplace. The may be a error code set, but you need a OBD scanner that can read TIPM codes.

Do not mistake temptation for opportunity
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
ColdCase is offline  
post #3 of 8 Old 07-24-2019, 01:53 PM
ColdCase
My Reality Check Bounced
 
ColdCase's Avatar
2011 WK 
 
Join Date: Sep 2009
Location: New England
Posts: 15,536
Here's an early model diagram that may match your Jeep. I'm guessing the small wire is the PWM speed signal, which should be pulses of 12VDC. A test light would dimly flicker. Dunno off hand what happens if you disconnect the wire and feed the fan module 12VDC. If you are not getting some 12VDC on the small wire (flickering test light) replace the TIPM (or the harness). If the light flickers, replace the fan. Look for connector corrosion.
Attached Thumbnails
Screen Shot 2019-07-24 at 3.52.21 PM.jpg  

Do not mistake temptation for opportunity
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
ColdCase is offline  
 
post #4 of 8 Old 07-24-2019, 02:10 PM Thread Starter
Pculvert
Registered User
 
Join Date: Jul 2019
Posts: 2
Nothing happens, I hooked it up directly and even tried adding 12v+ to the small wire to see if it would turn on and it wouldn’t that’s y I suspected the fan to be bad and swapped it out, so I have + and - on both thick wires, but no signal, bad tipm?
Pculvert is offline  
post #5 of 8 Old 07-24-2019, 04:04 PM
ColdCase
My Reality Check Bounced
 
ColdCase's Avatar
2011 WK 
 
Join Date: Sep 2009
Location: New England
Posts: 15,536
Thats what the book says, but check the harness for damage. You won't see a fan control signal unless the engine is running.

In the shop they use a OBD scanner to turn on the fan with ignition on when they want. Otherwise there would only be be a fan control signal when the PCM is calling for it which is when the engine is actually running. I'm not sure if hood needs to be closed too, so you may need to trick the hood latch into thinking its closed. You should see battery voltage on the thick Red wire, also between the red and black wire. You should have near zero resistance from the black wire to ground. There could be an error code in the TIPM that may help but you can't read those with most of your everyday OBD scanner.

Do not mistake temptation for opportunity
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
ColdCase is offline  
post #6 of 8 Old 07-24-2019, 05:49 PM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 8,013
your system is the one in diagram - that is HD cooling.

does your wire colors match ?

Why do I ask - I cannot read the colors* AND I believe another wiring. And before posting wires to test confirming we are on same page


* YES I am old

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #7 of 8 Old 07-24-2019, 05:55 PM
jtec
Web Wheeler
 
jtec's Avatar
2014 JK Wrangler 
 
Join Date: Oct 2017
Posts: 8,013
this is a different view of a HD wiring, I see a fuse and I can read the colors did this help OR your wires are different?
Attached Images
 

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
jtec is offline  
post #8 of 8 Old 07-26-2019, 11:19 AM
GPSBob
Registered User
2015 WK 
 
Join Date: Sep 2015
Location: Cedar Rapids
Posts: 172
Diagnostic Software like Appcar can manually set the PWM duty cycle for testing. (appcar-diagfca.com)
GPSBob is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome