overheating - Off-Road Forums & Discussion Groups
Jeep Lounge Still Jeepers, but not vehicle-specific. Good place to share your general mechanical tips, OT stuff.

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-06-2012, 11:32 AM Thread Starter
Join Date: Aug 2012
Location: Arkansas
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts

OK so i have been reading some threads on here about people having their jeeps overheat but I can still not figure out what is causing mine to overheat.
I have replaced heater hoses, heater core, radiator hoses, radiator, water pump, and thermostat. I have flushed it many times trying different flushes and i have taken the head off and had it inspected and cleaned up and put new gaskets on. I have tried everything i know to do and I am at the end of my rope. Can the water jackets in the block be blocked up too much even though I have flushed the crap out of it?

I drive a 99 wrangler tj with 4.0 I6
david2055 is offline  
Sponsored Links
post #2 of (permalink) Old 08-12-2012, 07:22 PM
Join Date: Sep 2006
Location: Vancouver USA
Posts: 282
Thanks: 0
Thanked 0 Times in 0 Posts
I don’t see where you replaced the water pump but the other reason for overheating can be a failing head gasket. A quick check of the dipstick will tell if any coolant has made its way into the oil (it will be milky) but another check for the head gasket is to take off the radiator cap when the system is cold then start the engine and watch the coolant at the filler. If you see bubbles the head gasket could be on its way out.

1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back
Saddle Tramp is offline  
post #3 of (permalink) Old 08-18-2012, 02:49 AM Thread Starter
Join Date: Aug 2012
Location: Arkansas
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
I have replaced both the water pump and head gasket. The funny thing is that it only over heated when I am running more than like 1800 rpm. If it starts to overheat than i can just slow down and it will just cool off.
david2055 is offline  
Sponsored Links
post #4 of (permalink) Old 08-18-2012, 08:16 PM
stump runner's Avatar
Join Date: Dec 2007
Location: Battle Ground Washington
Posts: 423
Thanks: 0
Thanked 5 Times in 5 Posts
as i understand it, a lean carb will cause over heating as will late exhaust timing. sometimes a mechanic will monkey with mix and timing to get an engine to pass smog test but not necessarily for the best economy, or life of the engine. I would start with checking the timing and go from there.
stump runner is offline  
Sponsored Links

overheat, overheating

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups 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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

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