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Unread 08-26-2010, 11:28 PM   #1
HawkeyeM67
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'88 overheating

Hey all, first post. Ever since I bought my XJ (hate to say so but it was probably a mistake) it has had overheating problems. It's an '88 and has 230,000 miles on it and i doubt its ever had a rebuild (it's feels old and tired). I've changed the thermostat but it still runs hot. the temp is usually anywhere between 230 to pegged. Anyway, I'm thinking it just needs a new radiator. I've heard thats a common problem with XJs. Any input?

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Unread 08-26-2010, 11:53 PM   #2
1990JEEPXJ
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is it boiling over at all? is the electric fan working? did you completely flush and properly burp the system after you replaced the thermostat?
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Unread 08-27-2010, 12:18 AM   #3
HawkeyeM67
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It's never boiled over and the electric fan comes on when the temp gauge gets near the red line. And I don't know about burping but I did change all the water. It kinda has me worried because I lose a bit of water over time. Could be a headgasket, idk.
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Unread 08-27-2010, 12:27 AM   #4
1990JEEPXJ
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it could be just air in the system still. when cool let the jeep run with the coolant cap off and the heater on for a bit until the thermostat opens up. then shut off the jeep and repeatedly squeeze the upper rad hose a few times, but it will be hot so use a rag or gloves of some kind.

try searching the forum for ways to burp the closed cooling system
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Originally Posted by Joe Dillard View Post
Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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Unread 08-27-2010, 12:37 AM   #5
HawkeyeM67
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Thanks for the info. How much of an impact would air in the system make tempwise?
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Unread 08-27-2010, 12:54 AM   #6
1990JEEPXJ
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a pretty big effect. does it heat up fairly quickly?
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Quote:
Originally Posted by Joe Dillard View Post
Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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Unread 08-27-2010, 01:54 PM   #7
HawkeyeM67
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Yea it heats up pretty quick and hovers between 215 and the redline. Then if i get any kind of load on it or its hot outside, above 85ish it redlines. Once it hits the redline the electric fan will come on. The temp keeps going up for awhile then slowly goes back down to the start of the red line. It keeps cycling like that all day.
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Unread 08-27-2010, 02:40 PM   #8
foggybottombob
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The redline on my '91 is at 260 degrees. What is redline on your '88? The electric fan should come on way before 260 degrees.
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Unread 08-27-2010, 06:22 PM   #9
HawkeyeM67
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Pretty sure its about that. It always seemed like the fan came on late to me too. I don't really think thats the big issue though. Pretty sure after lurking on the forum I'm gunna go with the open cooling system. I got the hookups with NAPA so I can get a rad for like 60 bucks.
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Unread 08-27-2010, 07:07 PM   #10
1990JEEPXJ
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it might be coming on the the right time, the temp gauge isnt exactly super accurate
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Quote:
Originally Posted by Joe Dillard View Post
Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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