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Jeep Wrangler YJ
YJ General Discussion
Help with overheating 4.0
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<blockquote data-quote="Flyer58" data-source="post: 426366" data-attributes="member: 18629"><p>Ok the T-stat out and still overheats still leads me to believe it's something else. Thermostats are used to control the minimum normal operating temperature not the maximum temp. The radiator should be designed to cool the high temp limits. </p><p></p><p>One additional wild guess since you mentioned the new flow cooler water pump, and I just came across this, is there's two different pump impellors for the same pump housing. A standard direction and a reverse direction impellor depending on which way the pump rotates. I'm not saying you have the wrong one but shipping errors do get made. I don't know about the high flow pumps or even if they make the two different impellors. Just a wild guess trying to help here.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 426366, member: 18629"] Ok the T-stat out and still overheats still leads me to believe it's something else. Thermostats are used to control the minimum normal operating temperature not the maximum temp. The radiator should be designed to cool the high temp limits. One additional wild guess since you mentioned the new flow cooler water pump, and I just came across this, is there's two different pump impellors for the same pump housing. A standard direction and a reverse direction impellor depending on which way the pump rotates. I'm not saying you have the wrong one but shipping errors do get made. I don't know about the high flow pumps or even if they make the two different impellors. Just a wild guess trying to help here. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Help with overheating 4.0
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