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Do TJ's usally operate at 210F?

39K views 122 replies 57 participants last post by  ninjaturtle0 
#1 ·
So, I just finished driving through a mud puddle, and found that my Engine was able to convert the splashed water to steam. Physical inspection, the radiator cap is hot (haven't opened yet due to heat), Coolant in the container, the engine is hot but not glowing red or anything crazy.

The thing is, the Thermostat acts like it's fine, slowly raising the temp to 210 (boiling) then staying there. Could it simply be the Thermostat is bad and is thinking is the engine is running comfortably and not supplying enough coolant? If so, is the Thermostat repairable or do I need to replace it.

Also, while waiting for the engine to cool, where is the location of the thermometer on a 4.0L Engine?
 
#122 ·
You can't get the radiator cap out of the opening? And open the hood before you kill the engine so you can listen for what is hissing when a helper shuts the engine off. My guess is the hissing is from the radiator cap leaking... if so, it needs to be replaced with a new 18 lb. cap.
 
#123 ·
You can't get the radiator cap out of the opening? And open the hood before you kill the engine so you can listen for what is hissing when a helper shuts the engine off. My guess is the hissing is from the radiator cap leaking... if so, it needs to be replaced with a new 18 lb. cap.
I had to get to work I ran out of time but thew my Jeep in the garage and took the truck today. I'll check when I get off regarding the hissing.
 
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