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Jeep Wrangler YJ
YJ General Discussion
My 93 Restoration Project
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<blockquote data-quote="Flyer58" data-source="post: 427582" data-attributes="member: 18629"><p>Thermostats control the minimum operating temp not the high end Your 180 degree tstat will open up at 180 degrees but the radiator is what controls the high end of the temps. </p><p></p><p>A big problem Jeeps have is getting air trapped in the engine's head creating hot spots. The system needs to be burped to get the air out and doing it on level ground may not work. I burped the air out of the system by raising the front end about 12 inches on some wheel cribs I made but you can also use ramps or park on a steep incline. Something to get the radiator up over the height of the engine. I trashed a company XJ 4.0 on the highway when it overheated and had just had a fluid change. Happened very quickly. The dealership explained the situation and what happened. They saw it all the time.</p><p></p><p>The proper thermostat should have a little loose rivet on going through the flange and should be positioned so that rivet is on the top side. It helps let air out.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 427582, member: 18629"] Thermostats control the minimum operating temp not the high end Your 180 degree tstat will open up at 180 degrees but the radiator is what controls the high end of the temps. A big problem Jeeps have is getting air trapped in the engine's head creating hot spots. The system needs to be burped to get the air out and doing it on level ground may not work. I burped the air out of the system by raising the front end about 12 inches on some wheel cribs I made but you can also use ramps or park on a steep incline. Something to get the radiator up over the height of the engine. I trashed a company XJ 4.0 on the highway when it overheated and had just had a fluid change. Happened very quickly. The dealership explained the situation and what happened. They saw it all the time. The proper thermostat should have a little loose rivet on going through the flange and should be positioned so that rivet is on the top side. It helps let air out. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
My 93 Restoration Project
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