high radiator pressure - Jeep Wrangler Forum

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

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-20-2012, 09:03 PM
Thread Starter
Join Date: Jun 2010
Posts: 1
tracker is on a distinguished road
high radiator pressure

hello, i have an 97 wrangler sport with the 4.0l and 5 speed, i have been having problems with it leaking antifreeze. at first it was coming from around the lower hose at the radiator and the water pump,i have replaced them and the stat as well, the radiator is about a year old and does not appear to be coming from there. i did a pressure test on it and could not find the leak,i pumped it up and it stayed at the 18 psi for half an hour. what i did find was that when running the engine with the tester on it the pressure slowly(needle does not jump) went up over 30 psi, i am guessing at that pressure it would come out anywhere..it does not run hot stays around the 210 mark as usual, it runs great, does not miss or blow any antifreeze out the exhaust, i am thinking head gasket.although it does not have water in the oil or oil in the water. any ideas?
tracker is offline   Quote
Old 02-21-2012, 07:09 PM   #2
Join Date: Nov 2011
Posts: 717
ballistx is on a distinguished road
Radiator Cap

The radiator cap should relieve the pressure at 15 psi. It sounds like the radiator cap is bad. You should be able to have it tested at an auto parts house.

ballistx is offline   Quote
Old 02-21-2012, 07:32 PM   #3
Join Date: Feb 2012
Posts: 5
HBJ069 is on a distinguished road
Buy the t-stat adapter for your pressure tester and check the cap. Normally pressure will rise a little as the water/coolant heats up.
HBJ069 is offline   Quote
Old 02-21-2012, 07:44 PM   #4
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 42,418
Jerry Bransford is on a distinguished road
The OE specified radiator cap is actually an 18 lb. model, it only starts relieving pressure at 18 lbs. If you're truly measuring higher than that, I'd suspect something with the radiator cap and replace it with another 18 lb. model. Excessive pressure can blow the lid or bottom off the radiator if it's really getting to 30 psi. I would double check that 30 psi reading, that seems unrealistically high for the cooling system.
When you have a choice, buy American.
Jerry Bransford is online now   Quote

Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
High School Jeepers Thread Drakea94 Off-Topic 104358 03-28-2017 01:09 PM
Tire Pressure and Voltage Regulator vekrause TJ General Discussion Forum 4 03-15-2012 03:48 PM
2 New Oil Pressure Sensors Blown in 2 weeks--ya think it's me? brent in az YJ Tech Forum 6 02-21-2012 07:16 AM
Radiator fan problem Chris M JK General Discussion Forum 4 02-20-2012 08:46 PM
low oil pressure at idle on 99 Jeep wrangler Rusty Russ TJ General Discussion Forum 2 02-19-2012 11:25 AM

All times are GMT -5. The time now is 03:14 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

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
« Back

Enter your email address:

Delivered by FeedBurner