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I recently purchased a '99 Sahara, so far, so good! However, I have noticed that if I leave her idling with the air con on for about 10/15 minutes, when I am out of the truck and have left the dogs inside... the cooling temp. goes up to over the 100c. When driving, everything is normal. Wondering if my idle revs are a bit high or could it be a pump problem. I have had the system flushed out and refilled with additive.
 

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I wouldn't think that 100C would be a problem. That's 212F. Mine normally runs just under 210F on the highway and can get up to 212 pulling long grades. Remember your cooling system is under pressure, so 100C is not boiling.
 
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