2005 WK - AC Problem - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > 2005 WK - AC Problem

Zone Offroad Body and Suspension Lift Kits, Brackets, DiscJeep Wrangler Framless, Bowless, Trektops 92-95 YJ, 97-06 Baseline 4x4 Lifetime Warranty 4340 Chromoly Axle Shaft Ki

Unread 09-07-2007, 07:48 PM   #1
Registered User
Join Date: Sep 2007
Location: Raleigh, NC
Posts: 1
2005 WK - AC Problem

I have a 2005 Grand Cherokee and my AC is acting up. The fan only comes on when I turn it to the highest setting, so it's either Off or very high. What could this be? Unfortunately I'm out of my warranty period, so is it something a handy person could fix themselves or should I take it in for service? Thanks in advance for any feedback.


mtthoward is offline   Reply With Quote Quick reply to this message
Unread 09-08-2007, 08:18 AM   #2
Registered User
Join Date: Jul 2007
Location: England
Posts: 2,944
Well it would be nice to know make if it’s auto zone control or manual.
Anyway I put together some info for you that should help both are behind the glove box hope it helps
If it’s auto control 4 pin plug on the blower module
Pin 2 Ground
Pin 3 blower motor control
Pin 4 live (relay out)
Check for lives and earths first ( but this should be ok as for fan does run on fast speed)
With an LED tester (PLEASE NOT A TEST LAMP OR VOLT METER) and module plugged in back probe pin3 (try not to damage the wire) the LED will flash at different speeds based on the how fast you set the dial. This shows that the control unit is ok and that your fault will be the module.

If manual control 4 pin plug on resistor
A blower motor M2 speed
B blower motor M1 speed
C blower motor Low speed
D blower motor high speed
Using an ohmmeter, check for continuity between all of the blower motor resistor terminals. In each case there should be continuity.
UK Chrysler Jeep Master Tec.

Last edited by merlinTec; 09-08-2007 at 02:12 PM..
merlinTec is offline   Reply With Quote Quick reply to this message

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.