Highschool budget 1999 xj build
CF Veteran
Joined: Apr 2008
Posts: 2,340
Likes: 8
From: Burlington, NC
Year: 1994...mostly...
Model: Cherokee (XJ)
Engine: 4.0L I6 HO, Lot's of Bolt Ons
So my Jeep when running the A/C down the highway with the exact same cooling system as you will run all but 230...
Been that way for 5 years... I've just gotten used to it.
I'd love to know if you find a solution.
Last trip back from Harlan it was that way and I rolled into a rain storm.
Soon as that cold rain hit the condenser my engine temps dropped straight down to UNDER 210...
Been that way for 5 years... I've just gotten used to it.
I'd love to know if you find a solution.
Last trip back from Harlan it was that way and I rolled into a rain storm.
Soon as that cold rain hit the condenser my engine temps dropped straight down to UNDER 210...
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by thetastelingers
How is the engine running? Feel sluggish? I wonder if the Cat is clogged causing it to work harder. Does it have a cat? meow?
Seasoned Member
Joined: Jan 2018
Posts: 313
Likes: 19
From: Soddy Daisy
Year: 01
Model: Cherokee(XJ)
Engine: 4.0
Have you changed the timing at all or the amount of fuel being provided?
Wonder if something is off creating more heat. Probably not, but do you have an AFR gauge?
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by thetastelingers
Ah. Ok then. Just trying to eliminate a potential cause.
Have you changed the timing at all or the amount of fuel being provided?
Wonder if something is off creating more heat. Probably not, but do you have an AFR gauge?
Have you changed the timing at all or the amount of fuel being provided?
Wonder if something is off creating more heat. Probably not, but do you have an AFR gauge?
CF Veteran
Joined: Feb 2013
Posts: 1,286
Likes: 2
From: Belton S.C.
Year: 1998
Model: Cherokee
Engine: 4.0
Hey brother, long time no BS'n LoL.
Bet you're running lean causing it to over heat. Haven't read through your specs yet, but did you have any type of tune done?
Bet you're running lean causing it to over heat. Haven't read through your specs yet, but did you have any type of tune done?
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by chipmaker
Hey brother, long time no BS'n LoL.
Bet you're running lean causing it to over heat. Haven't read through your specs yet, but did you have any type of tune done?
Bet you're running lean causing it to over heat. Haven't read through your specs yet, but did you have any type of tune done?
Seasoned Member
Joined: Jan 2018
Posts: 313
Likes: 19
From: Soddy Daisy
Year: 01
Model: Cherokee(XJ)
Engine: 4.0
Pull a spark plug and look at it if you don't have AFR gauge. That'll tell you a lot.
With motorcycles, we would run it up the road wide open, then immediately shut it off, pull a plug and read it to see if it was lean, fat, whatever and change jets to get it correct.
Last edited by thetastelingers; Aug 27, 2019 at 06:19 AM.
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by thetastelingers
That's what I was wondering as well, but if the builders say it'll compensate, it should. I would just want to make sure.
Pull a spark plug and look at it if you don't have AFR gauge. That'll tell you a lot.
With motorcycles, we would run it up the road wide open, then immediately shut it off, pull a plug and read it to see if it was lean, fat, whatever and change jets to get it correct.
Pull a spark plug and look at it if you don't have AFR gauge. That'll tell you a lot.
With motorcycles, we would run it up the road wide open, then immediately shut it off, pull a plug and read it to see if it was lean, fat, whatever and change jets to get it correct.
On another note, I put a big trans cooler on a while ago, but have yet to put a gauge in to read my trans temp. I wish they never stopped drilling the port on the trans in 98, but since they did it seems the only options are bung in pan, splice the hot or cold line of the cooler, or get creative some other way. Well I was thinking about it and I keep seeing these temp gauges with probes and I know I've installed fan controllers that probe the radiator fins, expansion valves in ac that clamp little probes to the line, and similar type things. So it got me thinking. How accurate would it be if I clamped a probe onto the hot line and wrapped it in exhaust wrap or something to insulate it from the ambient heat.

Something like this is what I'm thinking. Just don't want to make more splices into the cooler lines than I need to because every splice is another chance to leak.
Seasoned Member
Joined: Jan 2018
Posts: 313
Likes: 19
From: Soddy Daisy
Year: 01
Model: Cherokee(XJ)
Engine: 4.0
What about a hole in the drain plug to fit a sensor?
I have no experience with a sensor like that, so I can't comment.
After some researching, everyone says to splice into the line coming from the tranny.
I have no experience with a sensor like that, so I can't comment.
After some researching, everyone says to splice into the line coming from the tranny.
Last edited by thetastelingers; Aug 28, 2019 at 03:18 PM.
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by thetastelingers
What about a hole in the drain plug to fit a sensor?
I have no experience with a sensor like that, so I can't comment.
After some researching, everyone says to splice into the line coming from the tranny.
I have no experience with a sensor like that, so I can't comment.
After some researching, everyone says to splice into the line coming from the tranny.
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Joined: Dec 2016
Posts: 3,540
Likes: 416
From: SoCal
Year: 1987
Model: Cherokee (XJ)
Engine: 4.0
Send me a text later if you still want a wideband. I get a really good deal from AEM. Look up the X-series one and let me know if you like it. I am even considering selling mine from the Evo so I can get a different AEM one that works better with my ECU. So you can have that one extra cheap if you want.
CF Veteran
Joined: Apr 2008
Posts: 2,340
Likes: 8
From: Burlington, NC
Year: 1994...mostly...
Model: Cherokee (XJ)
Engine: 4.0L I6 HO, Lot's of Bolt Ons
I'm just hoping to avoid another splice, the factory radiator quick connect was cut off by someone so that soft line is hose clamped on and then there is a trans cooler spliced into the other soft line so there are already way too many fitting and possibly leakage points for my comfort.
Other wise your best bet is to just add in a Tee fitting.
With the AUX Trans cooler I would suspect your problem isn't the trans though, I thought mine might have been but turned out it was not.
You can take an IR gun and shoot it at the Trans Pan and it will tell you accurately what the temperature is.
Thread Starter
CF Veteran
Joined: Oct 2013
Posts: 5,924
Likes: 203
From: Greenville, SC
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by Desertfox1023
The line is cheap if you have splices that can be replaced with straight hoses.
Other wise your best bet is to just add in a Tee fitting.
With the AUX Trans cooler I would suspect your problem isn't the trans though, I thought mine might have been but turned out it was not.
You can take an IR gun and shoot it at the Trans Pan and it will tell you accurately what the temperature is.
Other wise your best bet is to just add in a Tee fitting.
With the AUX Trans cooler I would suspect your problem isn't the trans though, I thought mine might have been but turned out it was not.
You can take an IR gun and shoot it at the Trans Pan and it will tell you accurately what the temperature is.


