1990 XJ Overheating Problem. - Page 2 - JeepForum.com

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post #16 of 24 Old 10-24-2010, 09:39 AM Thread Starter
D0dgeRam1500
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Quote:
Originally Posted by EverydayXJ00 View Post
Is your auxiliary fan working? If your noticing more of an issue when your in stop and go situations and less on the hwy that could be the problem.
I'll have to check that next.


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post #17 of 24 Old 10-24-2010, 09:46 AM
cruiser54
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Quote:
Originally Posted by D0dgeRam1500 View Post
Could air be getting in due to a bad cap?
Not really, but if your crappy cap isn't holding pressure, it could cause overheating.........Wanna make a $9 gamble and try it since the one on there is probably gonna fail you in the future when you least need it to?
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post #18 of 24 Old 10-24-2010, 12:00 PM Thread Starter
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I'll order the cap tomorrow when I get home from school. Also my fan is belt driven but I have been looking into electric fans.

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post #19 of 24 Old 10-24-2010, 12:03 PM Thread Starter
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I have a new radiator and overflow, they are designed for the Cherokee but are aftermarket. Are you sure that cap will work with my setup?

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Last edited by D0dgeRam1500; 10-24-2010 at 12:04 PM. Reason: Grammar
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post #20 of 24 Old 10-24-2010, 06:29 PM
cruiser54
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If it's of the original design where the radiator has no filler neck or cap on it, and the recovery/pressure bottle is located near the passenger side firewall, then yes.
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post #21 of 24 Old 10-24-2010, 08:19 PM
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Quote:
Originally Posted by D0dgeRam1500 View Post
I have a new radiator and overflow, they are designed for the Cherokee but are aftermarket. Are you sure that cap will work with my setup?
If your radiator is in need of replacement anyway, go ahead and put them both on. This will probably fix your problem because it sounds like you're having the same problem I had on the '89 and '90 both. What I finally found was the problem on the '89 was the expansion and contraction of the overflow jug had warped the neck so that even a new cap wasn't sealing properly and once it warmed up it wouldn't hold pressure which caused it to overheat. So when I started having the same trouble with the '90 I immediately replaced the jug.
Also in another post you said your fan was belt driven. Does that fan sit in the center of the radiator or toward the passenger side. If it's not in the center your actually supposed to have an auxiliary electric fan beside it.
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post #22 of 24 Old 10-24-2010, 09:45 PM Thread Starter
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Originally Posted by sargergp View Post
If your radiator is in need of replacement anyway, go ahead and put them both on. This will probably fix your problem because it sounds like you're having the same problem I had on the '89 and '90 both. What I finally found was the problem on the '89 was the expansion and contraction of the overflow jug had warped the neck so that even a new cap wasn't sealing properly and once it warmed up it wouldn't hold pressure which caused it to overheat. So when I started having the same trouble with the '90 I immediately replaced the jug.
Also in another post you said your fan was belt driven. Does that fan sit in the center of the radiator or toward the passenger side. If it's not in the center your actually supposed to have an auxiliary electric fan beside it.
I ordered the new cap and it also appears that the fan next to the belt driven fan isn't kicking on. I hope its a sensor or something because the electrical is bad on the Jeep and I don't want to rewire it until spring.

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post #23 of 24 Old 10-25-2010, 08:44 PM Thread Starter
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And today I check the coolant level and find oil in the coolant...fml

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post #24 of 24 Old 10-25-2010, 10:08 PM
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i had the same problem and when throw three diff caps before finding one that would seal and never had a problem over heating after
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