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Jeep Wrangler YJ
YJ General Discussion
Still overheating
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<blockquote data-quote="Flyer58" data-source="post: 439340" data-attributes="member: 18629"><p>It's important to burp the cooling system by raising the front end and start the engine to get the coolant flow moving once the thermostat opens. You can see the air come out with the radiator cap off. The 4.0 and 4.2 are notorious for having air trapped in the back of the cylinder headand disrupting water flow.</p><p></p><p>I learned that from a dealership who said many shops didn't know about that. That was back in the early 90's.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 439340, member: 18629"] It's important to burp the cooling system by raising the front end and start the engine to get the coolant flow moving once the thermostat opens. You can see the air come out with the radiator cap off. The 4.0 and 4.2 are notorious for having air trapped in the back of the cylinder headand disrupting water flow. I learned that from a dealership who said many shops didn't know about that. That was back in the early 90's. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Still overheating
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