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Jeep Wrangler YJ
YJ General Discussion
Overheating advice (is it common for block to be vapor locked?)
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<blockquote data-quote="machoheadgames" data-source="post: 425819" data-attributes="member: 18789"><p>You gotta get the system as full as you can, squeeze the hoses some to burp a little bit of air out, and then you need to do warm up cool down cycles.</p><p></p><p>Since the system is sealed, it naturally works the air out by itself. When warming up, the heat causes the coolant to pressurize.This pushes some air into the reservoir, which obviously just bubbles out in the reservoir. Upon cool down, the volume of air that was originally pushed out during warm up is replaced with coolant. The system is sealed so it has to fill that space with something, which will be coolant as long as the overflow hose is below the surface of coolant in the tank.</p><p></p><p>It is very common to overheat right after servicing the system because you can’t fill it up all by yourself, you need to do a warm up/cool down once or twice to work the air out. Then it should be fine.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 425819, member: 18789"] You gotta get the system as full as you can, squeeze the hoses some to burp a little bit of air out, and then you need to do warm up cool down cycles. Since the system is sealed, it naturally works the air out by itself. When warming up, the heat causes the coolant to pressurize.This pushes some air into the reservoir, which obviously just bubbles out in the reservoir. Upon cool down, the volume of air that was originally pushed out during warm up is replaced with coolant. The system is sealed so it has to fill that space with something, which will be coolant as long as the overflow hose is below the surface of coolant in the tank. It is very common to overheat right after servicing the system because you can’t fill it up all by yourself, you need to do a warm up/cool down once or twice to work the air out. Then it should be fine. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Overheating advice (is it common for block to be vapor locked?)
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