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Jeep Wrangler YJ
YJ General Discussion
Running hot
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<blockquote data-quote="Flyer58" data-source="post: 433255" data-attributes="member: 18629"><p>I'm a little confused at the sequence. Did and actual high temp cause a problem with the head or were they just false readings?</p><p></p><p>One thing I've read and did experience with 4.0L XJ is air can get trapped in the head and cause overheating and cracking. This came from a dealership and their experience and the YJ may be the same.</p><p></p><p>Anyhow it's very important to ensure all the air is out of the cooling system and it may not work it's way out over time. The best thig to do is "burp" the system and an easy way to do it is raise the front end by parking on a slope or ramps, open the radiator cap (when cool), start the engine and make sure it's full with no more bubbles coming out.</p><p></p><p>It's worth doing anytime you open up the cooling system byt changing the coolant, pump, hoses of other work requiring you to drain the the system.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 433255, member: 18629"] I'm a little confused at the sequence. Did and actual high temp cause a problem with the head or were they just false readings? One thing I've read and did experience with 4.0L XJ is air can get trapped in the head and cause overheating and cracking. This came from a dealership and their experience and the YJ may be the same. Anyhow it's very important to ensure all the air is out of the cooling system and it may not work it's way out over time. The best thig to do is "burp" the system and an easy way to do it is raise the front end by parking on a slope or ramps, open the radiator cap (when cool), start the engine and make sure it's full with no more bubbles coming out. It's worth doing anytime you open up the cooling system byt changing the coolant, pump, hoses of other work requiring you to drain the the system. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Running hot
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