98 ZJ Air Conditioning/Engine Temp Question - JeepForum.com

 
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post #1 of 6 Old 07-22-2011, 08:04 PM Thread Starter
webibeay
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2004 KJ Liberty 
 
Join Date: Oct 2010
Location: Bristol, RI
Posts: 48
98 ZJ Air Conditioning/Engine Temp Question

Hey Folks -

I have a '98 ZJ with approximately 94k on it. Overall very good condition and runs perfectly.

I recently had the AC charged and as the weather has gotten warm and tried to start using it. Overall, the engine temp gauge sits just left the 1/2 way mark and never moves even when stuck in extended traffic jams

When using the AC almost immediately I start to see the temp gauge rise significantly. I've seen it get so far as a little over 3/4 with no affect on engine performance and the AC still blows ice cold.

As soon as I turn off the AC, the engine cools right down and stays as the usual less than 1/2 range.

I'm concerned as I don't want to overheat the engine and since this is a 2nd vehicle, I don't want to put thousands of dollars in repairs/have or have to replace the engine as I'm still paying on my primary ride. I need this one to last me another 2 years and then I can sell it/upgrade to a newer one.

To give you all some background, over the last 2 years and 10,000 miles the following work has been done:

- Radiator
- Thermostat
- Water Pump
- Coolant Temp Sensor
- All Hoses

Any thoughts on what it could be? I wonder if the folks at the service shop I took it to mucked something up and caused this....

Thanks in advance -


---------------------
Bill/Bristol, RI
2004 Jeep Liberty/KJ
2012 Ford Fusion Sport
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post #2 of 6 Old 07-22-2011, 08:07 PM
KingtheZJ
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1998 ZJ 
 
Join Date: Nov 2009
Location: Rochester NY
Posts: 2,660
a lot of us have this problem. i have replace the radiator in mine within a year and just put a trans cooler in. it still does it.

'88 XJ
'98 ZJ on 37s and tons
'02 Chevy 2500HD 8.1
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post #3 of 6 Old 07-22-2011, 08:17 PM
airwolf9090
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1996 ZJ 
 
Join Date: May 2011
Location: Clyo
Posts: 571
Yea i ran into the same thing, I too replaced everything like on your list the only thing i have not replaced is the water pump. But mine too will start to over heat and work its way up to the 3/4line and bam it will cool back down to the 210mark. And i got 190K miles as of today. Oh forgot i did the E-fan conversion and it makes no difference if its on or off when its doing this... like the other person said alot of people have this problem.

1996 Jeep ZJ Orvis
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post #4 of 6 Old 07-22-2011, 08:23 PM Thread Starter
webibeay
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2004 KJ Liberty 
 
Join Date: Oct 2010
Location: Bristol, RI
Posts: 48
Thanks Guys - glad to know it's not only me.... Frustrating though... damn AC works so well there's penguins running around inside the truck -- and works a hell of allot better than the AC in my 2010 Mustang.

I swear it's got to be something that's clogged from the AC system -- I just can't understand why this would happen...

---------------------
Bill/Bristol, RI
2004 Jeep Liberty/KJ
2012 Ford Fusion Sport
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post #5 of 6 Old 07-22-2011, 09:28 PM
blackzj
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1998 ZJ 
 
Join Date: May 2011
Location: orlando
Posts: 578
check the fan clutch zj's are known for having those things go
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post #6 of 6 Old 04-15-2012, 07:07 PM
AnotherRedZj
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1996 ZJ 
 
Join Date: Feb 2012
Location: fort walton beach
Posts: 2,457
Same deal here! Put a 185 thermostat in mine helped a bit but but loooking for a significant radiator upgrade at this point, fl heat is a b#&%$ while wheeling, gotta have that Ac!
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