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How HOT does she get?

Old 11-12-2016, 05:19 PM
  #1  
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Default How HOT does she get?

OK now that I have your attention....

I've got a new to me 2001 Grand Cherokee, 4.7, V8.

Switched over to an electric fan from the Hydra fan. (Hydra fan quit)

My question is this,
I am currently running at 206-207* coolant temp rock solid while driving and for the most part at idle. Temp climbs a little 209-211 if stopped in traffic for greater than 5-10 minutes.

This is in the Phoenix AZ area, during fall temperatures +/- 90*-70*

Just wondering what others with like engines are seeing on temps, is this average on this vehicle, most of my other vehicles are always at 200-204* even during summer.

Thx
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Old 11-12-2016, 06:43 PM
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Okay, a jeep's normal operating range is 195-212*F. The 195 is thermostat set temp and my fan cuts on high at 212. I wouldn't worry too much unless it gets above 220-230. A 50/50 mix of coolant at 16 psi boils at about 250-260. Once boiling begins, steam pressure becomes astronomical. This is when you start blowing radiators and stuff.
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Old 11-13-2016, 09:05 AM
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Your temps are normal.
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Old 11-13-2016, 09:47 AM
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My 04 WJ with the 4.7HO runs about the same temps even while towing a trailer (all steel 18' car hauler) with my XJ on it. I do have the towing pkg. with factory Class IV hitch and 3.73 gear.


I have both fans on mine from factory.
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Old 11-21-2016, 06:06 AM
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OK good to know guys, just wasn't sure of the range on this "new to me" jeep.
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Old 11-21-2016, 12:46 PM
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The newer emission requirements make it necessary for the engine to operate at 195* to reduce nitrous oxide levels. Gaskets, pistons, and bearings start to melt at about 260*, so anything between those is safe, although I get worried when it gets above 230*.
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