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Jeep Wrangler YJ
YJ General Discussion
Need cooling help: 2.5 runs over 220 degrees
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<blockquote data-quote="Flyer58" data-source="post: 425881" data-attributes="member: 18629"><p>I haven't had this problem yet but expect it will happen, it seems to be common. When I rebuilt my 2.4L I had the machine shop replace the engine block drain plug because it was rusted in place. You may have sediment in the block but I'm not sure that's the cause in your case.</p><p></p><p>Air in the head/block seems to be a very common issue. It's recommended (by others, not in the shop manual) to raise the front end when filling the system. I drove mine up on ramps so the air goes towards the cap. I even started the engine without the cap until it warmed up and found lots of air burbing out the top.</p><p></p><p>The proper Jeep thermostat should have a small hole in the flange with a loose rivet in it and should be oriented so that hole is in the top side when installed. This might help allow some trapped air come out as you fill the system but it takes a long time. </p><p></p><p>If the rubber on the radiator cap looks worn it may need to be replaced too. Are you losing coolant? It may be boiling out.</p><p></p><p>The last thing may be to have someone flush the radiator.</p><p></p><p>Cap with rivet.</p><p></p><p>[ATTACH=full]115942[/ATTACH]</p></blockquote><p></p>
[QUOTE="Flyer58, post: 425881, member: 18629"] I haven't had this problem yet but expect it will happen, it seems to be common. When I rebuilt my 2.4L I had the machine shop replace the engine block drain plug because it was rusted in place. You may have sediment in the block but I'm not sure that's the cause in your case. Air in the head/block seems to be a very common issue. It's recommended (by others, not in the shop manual) to raise the front end when filling the system. I drove mine up on ramps so the air goes towards the cap. I even started the engine without the cap until it warmed up and found lots of air burbing out the top. The proper Jeep thermostat should have a small hole in the flange with a loose rivet in it and should be oriented so that hole is in the top side when installed. This might help allow some trapped air come out as you fill the system but it takes a long time. If the rubber on the radiator cap looks worn it may need to be replaced too. Are you losing coolant? It may be boiling out. The last thing may be to have someone flush the radiator. Cap with rivet. [ATTACH type="full"]115942[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Need cooling help: 2.5 runs over 220 degrees
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