overheating only when a/c is on - Page 2 - JeepForum.com
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post #16 of 16 Old 07-28-2016, 06:59 PM
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Join Date: Oct 2015
Location: Albany
Posts: 287
If the manifold is glowing red then you have something going on beyond the cooling system. My first impression is an obstructed exhaust system. Also, maybe a super lean fuel mixture (...?) although I doubt you can get it that hot just by running lean.

I don't think you should be driving it until you figure this out. Chances are you'll wind up doing a lot of expensive damage if it keeps spiking like that. I know that is probably the stupidest, most obvious advice on earth, but I just felt like I had to say it.

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