Originally Posted by loganzillmer

Well, I think I ran into my first major problem, and I don't think I am going to like this one. My wife and I drove the XJ up North about 100 miles to her parents for the weekend. When we got out after the ride up there, I noticed my coolant was boiling. The engine temp was fine the whole way up. (When we got off the freeway, I did notice that it went to the next notch after 210 but the fan was on and it went back down quickly.)
Well, after the drive home, when I got off the freeway, it sat idle at the light and the temp rose again, but this time it suddenly jumped all the way up and the "check gauges" light came on. I pulled it into a parking lot and popped the hood. The coolant was boiling again and the engine bay seemed extremely hot. We were only a few miles from home so I let it sit for about 10 mins and then started it up, it started poorly and didn't idle very well for a minute, but then it evened out. On the way home it drove fine and the temp was just a tick over 210.
The oil pressure sat at around 50 most of the way home as well.

My first guess is that it needs a new head gasket. I am really hoping the head isn't cracked.

What do you guys think? Thanks.

Originally Posted by dirtyjerz

try replacing the thermostat first sounds like yours might be getting stuck "closed". xjs typically run hot mine normally runs around 210 or a lil over in traffic or on the highway. As long as it doesn't boil over you should be fine. did it ever go into the red?

Originally Posted by salad

Can you elaborate on "coolant boiling"? How exactly did you determine this? It should never actually boil, even when overheating.

Is this XJ new to you? I'm curious about its maintenance history.

Originally Posted by loganzillmer

After hot, the coolant boils inside the reservoir, but doesn't boil out.

Originally Posted by loganzillmer

I have had it for a few months. It has 200k on the engine. There wasn't much paperwork from major repairs, just small stuff (ie tires, batt, AC, brakes, oil changes). I had the serp belt, and pinion seal done when purchased per suggestion by the mechanic who performed the used car inspection. I don't think it was driven much in the last two years. It was the personal car of a dealer. He picked it up in NY (no rust) when he was picking up some Subarus (which is what he sells exclusively) because it was in great shape and he got a deal. He hoped to give it to one of his kids but they didn't like the rough ride, so he sold it. He had his shop do anything he would normally do to prep a car for sale, but this was 2 years ago.
Recently I also had the transfer case gasket and oil pan done. Everything has been done at first sign because I wanted to get it into really good reliable shape before I did anything 'after-market' to it, but little things keep popping up, haha. It has run really well for me. This is the first sign of a real problem. Everything prior has been nitpicking.

Originally Posted by MattR

Hi.

So second question in less than a week. I've had my 93 Cherokee for a couple of weeks and it has started fine every time up until today.

Today I drove down to shops and when I got back in to start it up it didn't turn over. It didn't even make a noise. I tried a few more times, nothing. The ABS light would come on again when I tried to start it.

Out of the 8 attempts to start it there were maybe 2 were it turned over a bit. The other times it was totally silent, not even the solenoids.

I then moved the car out of park and back in, the tried it and it started straight away.

Any idea what is going on? Thanks in advance.

Originally Posted by salad

Okay. That is normal for when super hot coolant gets into the reservoir - rather when it gets back to atmospheric pressure.



Well, cooling system maintenance on 2000 and 2001 models is EXTREMELY important. Not sure if you've learned about the casting defect on these years but if you keep doing that you can expect a cracked head.

Based on what you've written, it's likely overdue for an overhaul. Basic stuff first:
- Total flush of cooling system until water runs clear. Block, radiator, and heater core should be flushed forwards and backwards.
- Check old coolant for oil contamination
- Good idea to do an oil change at the same time, check it for coolant contamination
- New Mopar 195 degree thermostat
- New water pump
- New fan clutch
- Verify that fan shrouds are in place

There is no such thing as wasted money on cooling system maintenance. Especially on an '00/'01. If you want some horror stories look up "0331 head crack".

So far nothing you've posted raises any flags other than your model year. Catch up on maintenance and let us know!

Originally Posted by 1991Jeep_Man

Has anyone here ever used Freeze 12/ES-12 in their R-12 ac system? My 91 has no working ac and I've been wanting to fix.
Also, how common are ac evap coil leaks?

Originally Posted by DESERTXJ206

Iv searched google for multiple sites and cant find exactly what im looking for, Id like to find a write up or list of "4-port injectors" for a 88 RENIX jeep. I know 703s, but I want to find a vehicle list and years of the vehicles. I may just buy new ones from one of those vehicles listed through rock auto if I cant find any at junk yard.

Does anyone have a link to a vehicle and year list for the injectors?

Originally Posted by 884x4

746 injectors is what people round here use in our renix jeeps.
Dflintstone is the man who found those to be a great injector for renix era jeeps.
I'm running them now

Originally Posted by cruiser54

Best I've ever used for both power and economy.

Originally Posted by salad

Okay. That is normal for when super hot coolant gets into the reservoir - rather when it gets back to atmospheric pressure.



Well, cooling system maintenance on 2000 and 2001 models is EXTREMELY important. Not sure if you've learned about the casting defect on these years but if you keep doing that you can expect a cracked head.

Based on what you've written, it's likely overdue for an overhaul. Basic stuff first:
- Total flush of cooling system until water runs clear. Block, radiator, and heater core should be flushed forwards and backwards.
- Check old coolant for oil contamination
- Good idea to do an oil change at the same time, check it for coolant contamination
- New Mopar 195 degree thermostat
- New water pump
- New fan clutch
- Verify that fan shrouds are in place

There is no such thing as wasted money on cooling system maintenance. Especially on an '00/'01. If you want some horror stories look up "0331 head crack".

So far nothing you've posted raises any flags other than your model year. Catch up on maintenance and let us know!