Renix burping question
CF Veteran
Joined: Nov 2011
Posts: 2,433
Likes: 6
From: Northern MN
Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
This is gold bud. I did the temp sensor thing with my old jeep and it never really worked. So with my new renix, I fill the bottle while the engine's idling. When it stops draining cap it and drive, check it out later.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO

Coolant enters and exits the front (high end) of the motor. Air naturally migrates up, does it not? No air/coolant exits the back of the motor so why would u want to raise the back end? Why would u want to remove a plug at the low end of the motor? That's just another duh myth.What I post here, regarding cooling systems, is true for virtually any water cooled vehicle out there.
Anybody that does any type of cooling system maintenance on an old/used car, then slams the hood down for a year calling it good is just asking for problems. Read my sig.
Last edited by djb383; Feb 8, 2015 at 01:30 PM.
Thread Starter
Junior Member
Joined: Jan 2015
Posts: 61
Likes: 0
From: Germany
Year: 1990
Model: Cherokee
Engine: 4.0
For each one of these TRUE/CORRECT XJ cooling system statements, there must be 10,000+ FALSE/INCORRECT statements post on the Internet.
I will reemphasize "do not drill hole(s) in the XJ stat"......doing so accomplishes nothing other than slowing down the engine warm-up process and fast engine warm-up is important. Besides, there is a dime sized hole directly beside the t-stat anyway (the bypass) so why drill holes in the stat??????.....because some goober on the Internet says it's a good idea?....NOT.
I will reemphasize "do not drill hole(s) in the XJ stat"......doing so accomplishes nothing other than slowing down the engine warm-up process and fast engine warm-up is important. Besides, there is a dime sized hole directly beside the t-stat anyway (the bypass) so why drill holes in the stat??????.....because some goober on the Internet says it's a good idea?....NOT.

Thread Starter
Junior Member
Joined: Jan 2015
Posts: 61
Likes: 0
From: Germany
Year: 1990
Model: Cherokee
Engine: 4.0
I installed a new CTS and flushed the cooling system. I put a new thermostat in without holes!
So I started to burb like I should, filled with 50/50 mix cap open and idle.
started to go higher revs, about 3000 rpm. than idle again and so on. there are still small bubles coming up from the bottle...
Is there any chance air could get into the system?
So I started to burb like I should, filled with 50/50 mix cap open and idle.
started to go higher revs, about 3000 rpm. than idle again and so on. there are still small bubles coming up from the bottle...
Is there any chance air could get into the system?
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Is your video showing fresh 50/50 coolant?......kinda looks like straight water and a little rusty at that. It takes several heat/cool cycles for all the air to work it's way to the bottle. The upper portion of the bottle will always have some air in it but the bottle must never be allowed to be empty of coolant. If the bottle is ever completely empty, then air is being re-introduced into the cooling system.
On this side of the pond, here's what fresh coolant looks like.
On this side of the pond, here's what fresh coolant looks like.
Last edited by djb383; Feb 11, 2015 at 06:06 PM.
Thread Starter
Junior Member
Joined: Jan 2015
Posts: 61
Likes: 0
From: Germany
Year: 1990
Model: Cherokee
Engine: 4.0
Yellow antifreeze looks like this when it is mixed up. Sounds strange but is true. Believe me:-)
Last edited by Steffen84; Feb 15, 2015 at 04:39 AM.
CF Veteran
Joined: Nov 2011
Posts: 2,433
Likes: 6
From: Northern MN
Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
I have found a little crack in my bottle. when I came home I saw that pressure comes out right under the cap. Video Link: http://youtu.be/stVfcLxqPsE
I have found a little crack in my bottle. when I came home I saw that pressure comes out right under the cap. http://youtu.be/stVfcLxqPsE
http://macsradiatorshop.com/surge-ov...tanks-366.html


