05 Unlimited overheating, opinions? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > General Jeep Discussion

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 09-10-2013, 01:32 PM   #1
Join Date: Sep 2010
Location: Westborough, Massachusetts
Posts: 6
05 Unlimited overheating, opinions?

I have a problem with my wrangler overheating which seems odd to me. It is a 4.0l engine. Under normal steady driving, there is no problem. When stuck in traffic, on a slow trail ride, or just sitting at an idle, the temperature can jump from normal (210F) to hot (250F) in about 15 or 30 seconds. If I see it start to rise, and shut off the engine, wait a minute and restart, it might either drop quickly back to almost normal (210~220) or it could be pegged at top of the gauge (260+). I can always bring it back down to almost normal by bringing the RPMs up to at least 2000, either driving, or if I am stuck in traffic, by revving the engine a little. once the revolutions are up to over 2000RPM it only takes 15 or 30 seconds to bring the temperature back down.
About once a week, after starting, I sometimes hear a few "chirps" from the belt. My thought is that the water pump is dying, therefore it is resisting the belt sometimes and making it chirp. It also makes sense to me that the water pump might not be moving any water at low RPMs therefore the water near the temperature sensor can heat way up, but at higher RPMs it kicks in and moves all the cooler water from the radiator past the sensor and cools it down quickly.
I am no mechanic, so I don't know if my theory makes sense. I would appreciate any opinions.

Dirkg is offline   Quote Quick Reply
Old 09-10-2013, 08:22 PM   #2
larjeep's Avatar
Join Date: Nov 2009
Location: new jersey
Posts: 1,103
You probably have a bad fan and its slipping clutch is wearing out on fan. You can goggle on how to check the fan blade.

larjeep is offline   Quote Quick Reply
Old 09-11-2013, 12:03 AM   #3
Join Date: Dec 2011
Posts: 611
Have plenty of coolant?? I had a dodge truck that would do the exact same thing - heat up then drop when I revved it up.. It only did it when I was low on coolant.. Had a leak somewhere.
I-Want-A-Jeep is offline   Quote Quick Reply
Old 09-13-2013, 05:41 PM   #4
Join Date: Sep 2010
Location: Westborough, Massachusetts
Posts: 6

I will check both. I think there should be plenty of coolant. I checked and refilled it when it first started happening.
Dirkg is offline   Quote Quick Reply
Old 09-15-2013, 12:09 AM   #5
hooper's Avatar
Join Date: Sep 2012
Location: Rosharon, Tx.
Posts: 246
It could also be time for a new radiator.
hooper is offline   Quote Quick Reply


Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 email 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

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 Off
Refbacks are Off

Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 04:16 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC