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Unread 08-06-2013, 11:12 PM   #1
HFPerformance
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1997 cherokee sport 4.0 (xj) still overheating...

Hi everyone, i have a 97 4.0 xj. Recently the radiator got damaged from age so so i changed it along with upper and lower hoses and new t stat. As well a fan clutch, secondary fan, and radiator cap. However the jeep is still overheating. I sat and had it with the radiator cap off for quite a while and it does not over heat. I am getting alot of air coming out and at times the coolant is just being pushed out. I have gone through about 6 gallons of coolant trying to get all the air out. It does not overheat with the cap off. However when i put it on a go for a drive about a mile or two later it starts overheating. I thought maybe the head gasket since it has 230xxx miles. However it is not mixing or smoking. Also when it overheats and i pull over open the hood and loosen the cap a bit i get alot of air and vapor coming out before any coolant starts coming out. Any idea or help with this problem?

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Unread 08-06-2013, 11:38 PM   #2
Holder350
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A compression test will rule out a head gasket.

Are you positive its overheating? How have you confirmed the gauge reading?

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Unread 08-06-2013, 11:47 PM   #3
HFPerformance
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The gauge is going to the read, and i plan on doing in compression test next to see if the head gasket needs a change.
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Unread 08-07-2013, 06:36 AM   #4
wgirvine
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It's been my experience that coolant blowing out of the cap is caused by a blown head gasket.
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A compression test will rule out a head gasket.
Not always.
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Unread 08-07-2013, 09:31 AM   #5
HFPerformance
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After some searching and reading i have come to the conclusion that it has to be my head gasket. The 97's are an open system so even if so much air was trapped it should have been out by now. Also the way it pushes out the coolant while it idles with the cap off indicates towards the head gasket also. So ill be ordering the felpro gasket set today and start taking the head off. Any advice on what i should change while im at it? Should i replace or reuse the head bolts/studs?
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Unread 08-07-2013, 02:08 PM   #6
WillieWildcat
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Quote:
Originally Posted by HFPerformance View Post
After some searching and reading i have come to the conclusion that it has to be my head gasket. The 97's are an open system so even if so much air was trapped it should have been out by now. Also the way it pushes out the coolant while it idles with the cap off indicates towards the head gasket also. So ill be ordering the felpro gasket set today and start taking the head off. Any advice on what i should change while im at it? Should i replace or reuse the head bolts/studs?
Everything that I've read about head gasket replacements states that new head bolts/studs should be used. May as well only do the job once, right? I think they're only around $40 for the set, anyway.

Did you ever flush the system after replacing the original radiator? If the radiator failed, is it not possible that there may be debris choking up the flow of coolant somewhere? When you replaced the hoses and t-stat, did there appear to be any buildup?
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Unread 08-07-2013, 06:29 PM   #7
1CleanTJ
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to be positive about a head gasket, they make a dye tester that will turn from blue to green/yellow if exhaust gas's are entering your coolant system
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Unread 08-07-2013, 08:07 PM   #8
dawitgk
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Sorry to hijack this thread but guys I need help. 96 XJ overheating and it is driving me nuts. I have replaced just about everything - radiator, water pump, mechanical fan clutch. I even tapped into my electric fan and I have it running all the time. And FINALLY i took out the thermostat! Still the thing kicks it up to the 240s. I have flushed it twice. I have flushed it in an inclined and declined fashion trying to get the "trapped air" out. Still 240s. Any thoughts?
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Unread 08-07-2013, 08:33 PM   #9
Holder350
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Verified the actual ruining temp with a IR thermometer?

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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 08-07-2013, 08:45 PM   #10
HFPerformance
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Yeah i flushed it twice, and when i changed the hoses and tstat i did not see any signs of any build up
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Unread 08-07-2013, 08:47 PM   #11
Holder350
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Next step I would take. Would be a compression test.

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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 08-07-2013, 09:16 PM   #12
chriskeenan
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do the tests first, head gaskets suck to replace, ask me how i know.
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Unread 08-07-2013, 10:16 PM   #13
jeepster383
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Quote:
Originally Posted by HFPerformance
After some searching and reading i have come to the conclusion that it has to be my head gasket. The 97's are an open system so even if so much air was trapped it should have been out by now. Also the way it pushes out the coolant while it idles with the cap off indicates towards the head gasket also. So ill be ordering the felpro gasket set today and start taking the head off. Any advice on what i should change while im at it? Should i replace or reuse the head bolts/studs?
Go have it block tested first. Don't guees at it.
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Unread 08-08-2013, 12:37 PM   #14
dawitgk
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Quote:
Originally Posted by Holder350
Verified the actual ruining temp with a IR thermometer?

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That is next! Thank you!
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Unread 08-09-2013, 01:20 PM   #15
Runforfun1
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Following this thread with great interest.....my 96 is having the same overheating issue and I have replaced everything in the syste, except for the head gasket. Compression test this weekend. When I replaced the radiator, I noticed it was full of nasty brown distgusting water and debris.....I'm hoping it is just a clog somewhere.....any tips on flushing out the system.....I have done the basic flush and fill and let it run and flush repaeat several times. I am still getting some nasty looking water out of it but less than before. When you start the jeep and drive it, it will bury the temp gage hot in about 5 miles.
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