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http://www.xjtalk.com/showthread.php?t=8001

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229

What a difference. Now which was it? Filling up the radiator or the air temp?

It never got about 212 yesterday.

New thermostat (as with all things) can be bad new, or go bad at any time, but this one was installed about two months ago. It's still good advice, thanks.

An Android phone running...

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A generic bluetooth enabled elm327 based OBDII scanner.

http://obd2store.com/images/obd2/bluetooth%20ELM327.jpg

For example... :link:

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So I took this screen capture about 3 miles before getting to the office. Air temps 81 to 83 degrees, and with A/C full blast.

After my post last night I got to thinking about another...

A few days ago I noticed the top coolant temp rising day after day. This usually means that the coolant level is getting low. After getting home Monday evening I checked the fan clutch, but didn't...

Well I monitored the temp today. It took 5 miles at an average speed of 27 mph, 98 degree air temp, to get to 210. At 7 miles it was up to 214.

About 12 miles I was seeing 232, and it would drop...

I didn't think of that. In the hay days of the internet who would think of picking up something, physically, and measuring it! What a concept!

I know (or knew) the tube diameter of the radiator I have now. What I would like to know is the tube diameter of the factory two core that my XJ came with. Then I would know what to look for.

Matt wanted me to hook up the OBDII today and see just how hot the cooling system was getting. Here's what I found.

230.0 degrees, at times.

This occurred after going 3/4 of the trip home,...

I've been putting it off, but yeah it came with a dual row and that's what I need to put back in it. I just need to research tube diameters and make sure I get something that is really bigger and...

Okay so first real test of the cooling system. Now I don't have the high flow water pump, thermostat or thermostat housing on the 4.0l right now. Plus I have a stock hood, so the cowl induction...

Let me set the record straight here. I have not been pleased with the cooling system performance of the Jeep 4.0L Cherokee. Even before the lift and tires. Now with that said I did find that I...

Wow the price has really come down on the water pump, it was up around $300...

Now $169.95

http://www.hesco.us/img.asp?tn=showandtell_formsRecordsPhotos&fn=LargePhoto&idn=ID&id=55182


:link:

Yep I agree. Bad thing about posts, they are hard to find, or hard to remember. I never updated this one.

I went to hi-flow everything (thermostat, thermostat housing, and water pump). ...

Yeah I know. I don't ever recall having a vehicle do what mine is doing now. Basically I am generating more heat than the system can keep cooled to 210 degrees. The coolest it can keep it is the...

I don't think the lower degree thermostat makes any difference in the mpg. If it does it's less than 1 mpg. I've read the same from NAXJA folks. If the cooling system isn't capable of keeping the...

Yes, I have looked at that. I want to get one, but like you the price is a bit high. I have the hesco high flow thermostat housing and thermostat now.

I'll be adding a B&M transmission cooler...

Thanks, I'll have to look into that.

Back in my small block chevy days the first thing we did was trash that clutch and fan and replace it with a spacer and fixed fan.

That gives me hope. I have the factory transmission cooler which I am sure helps, but it is really small compared to the aftermarket ones.

Well I finally did what I wanted to do and got a 3 core radiator. After some research I went with radiatorbarn.com (I know the name sounds ominous).
They were great! No problems and I had my new...

Update -

As i expected the engine cooling system is running a few degrees cooler. I suspect this is due, again, to the thermostat opening at a lower temperature.

The temperature does rise as...

As promised here are the temperature readings while I was coming home from work today. This first picture was taken after the engine had been running for about 20 minutes. I had traveled between 40...

I received the thermostat housing from hesco yesterday. I started to install all the goodies, but why do today what you can put off until tomorrow?

I highly recommend the hesco thermostat...

http://muckleroy.com/images/JeepTempGauge1.jpg

About 2 years after I purchased my 1998 Jeep XJ new "literally from the show room floor", it overheated. Since I was on Interstate 10 and going 80...