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Old 01-15-2014, 03:25 PM
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My '95 ZJ lmtd. a few problems

So I have a 1995 Jeep ZJ with 242k miles. Runs good, but look like burns oil.

The main concern for me is the temperature. It never reaches 210. It gets about half way in between. I changed the thermostat, put in new coolant, even checked the actual temperature with the laser thermometer in the engine when she is running. The temperature matches the gauge reading. I do not know what is going on here. Any advise or suggestions?

Also, her T-case is acting funny. She has Quadra trac on and in 4HI it works perfect, but I can't engage 4LO. Feels like something is loose. I used to be able to engage to 4LO, but lately I haven't been able to. Any suggestions on this?
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Old 01-15-2014, 04:18 PM
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Re: My '95 ZJ lmtd. a few problems

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Originally Posted by Tuzmaster View Post
So I have a 1995 Jeep ZJ with 242k miles. Runs good, but look like burns oil.

The main concern for me is the temperature. It never reaches 210. It gets about half way in between. I changed the thermostat, put in new coolant, even checked the actual temperature with the laser thermometer in the engine when she is running. The temperature matches the gauge reading. I do not know what is going on here. Any advise or suggestions?

Also, her T-case is acting funny. She has Quadra trac on and in 4HI it works perfect, but I can't engage 4LO. Feels like something is loose. I used to be able to engage to 4LO, but lately I haven't been able to. Any suggestions on this?
Did you use the california thermostat when you swapped?
Is the coolant always flowing thru the radiator, which might indicate something fishy in the seating of the thermostat [the 6 had multiple thermostats, would not surprise me if the V8 did as well].

As for the Q-track, you are probably gonna have to crawl under there and look for stuff being loose...
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Old 01-15-2014, 04:46 PM
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Re: My '95 ZJ lmtd. a few problems

I used a failsafe thermostat and bought it in Colorado Springs. I think there is only one thermostat. Have never heard of 2. coolant seems to flow fine although at one point i drained it and flushed it with water and the flow was okay out of the engine. I have installed that brand of thermostat on my last jeep and it worked fine. I don't know what else to check.


On the T-case i was told to hammer slightly in the linkage that goes into it. Should i try that?
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Old 01-23-2014, 02:52 PM
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Re: My '95 ZJ lmtd. a few problems

Are you sure the cooling system is full?
we got a '96 5.2 for one of the kids a while back. I had a heck of a time filling/purging the cooling system,heck I still think it has air in it. I drove it up(nose up) a very steep berm to try and get that damn upper rad hose filled... still feels like its not full. it runs ok, but she says the heat sometimes gets cool for a little bit. gauge shows fine

What's the trick to purging the air on these?

when you try 4lo what happens? clunks? grinding?
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Old 01-23-2014, 03:47 PM
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Re: My '95 ZJ lmtd. a few problems

Quote:
Originally Posted by Tuzmaster View Post
I used a failsafe thermostat and bought it in Colorado Springs. I think there is only one thermostat. Have never heard of 2. coolant seems to flow fine although at one point i drained it and flushed it with water and the flow was okay out of the engine. I have installed that brand of thermostat on my last jeep and it worked fine. I don't know what else to check.


On the T-case i was told to hammer slightly in the linkage that goes into it. Should i try that?
There are multiple thermostat models. I'd quote from the Factory Service Manual, but sold it to the guy who bought my 95 Limited ZJ 4.0

The thermostat only controls when it opens to run coolant thru your radiator. Once it opens all the way, from then on the engine temperature is a function of how well that radiator can keep dumping heat. The 4.0 radiators tend to be rather effective at this even in places like Death Valley. If you have an aftermarket it may be even better than a factory one.

If you don't have the California emissions stickers anywhere, you would not NEED that thermostat.

I wouldn't hammer on the linkage, but firm tugs, etc. would be appropriate.
The transfer case isn't that big a deal to pull if you have good ramps or safety stands and a few buddies. Mine never had issues at mileage similar to yours, so never had to do this myself.

FSMs should be available on EBay if they aren't still available at Tech Authority. Best investment you'll ever make.
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Old 01-23-2014, 03:49 PM
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Re: My '95 ZJ lmtd. a few problems

Quote:
Originally Posted by 4.whoa View Post
Are you sure the cooling system is full?
we got a '96 5.2 for one of the kids a while back. I had a heck of a time filling/purging the cooling system,heck I still think it has air in it. I drove it up(nose up) a very steep berm to try and get that damn upper rad hose filled... still feels like its not full. it runs ok, but she says the heat sometimes gets cool for a little bit. gauge shows fine

What's the trick to purging the air on these?

when you try 4lo what happens? clunks? grinding?
Dunno on the purge. After swapping in a radiator on the 4.0, it took forever to get rid of all of them, and that included a lot of trying to squish hoses, vocabulary exploration, etc.
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Old 01-24-2014, 09:21 AM
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http://www.jeep4x4center.com/knowledge-base/index.htm
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