Strange overheating behaviour
#1
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Year: 2000
Model: Cherokee
Engine: 4.0 6L
Strange overheating behaviour
Hello,
Got a concern about my 2000 XJ. Its very hot on the west coast at the mo and using the a/c for the first time in the 6 months I had the XJ. Blows nice and cold, running temp goes up a little bit while I am driving, but nothing to much (normally runs around 200, this puts it to 210). When I stop the engine though, weird stuff happens. The coolant bottle fills up nearly to the top with very hot coolant fluid. I can hear a slight hiss from around the radiator cap, and the engine temp goes right up to max. After 20 mins or so its cooled down again. Now I know its v.bad to overheat XJ's, especially of this year, so I am wanting to fix the problem. Any thoughts other than, don't use the a/c?
Thanks
Got a concern about my 2000 XJ. Its very hot on the west coast at the mo and using the a/c for the first time in the 6 months I had the XJ. Blows nice and cold, running temp goes up a little bit while I am driving, but nothing to much (normally runs around 200, this puts it to 210). When I stop the engine though, weird stuff happens. The coolant bottle fills up nearly to the top with very hot coolant fluid. I can hear a slight hiss from around the radiator cap, and the engine temp goes right up to max. After 20 mins or so its cooled down again. Now I know its v.bad to overheat XJ's, especially of this year, so I am wanting to fix the problem. Any thoughts other than, don't use the a/c?
Thanks
#3
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Year: 2000
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Engine: 4.0 6L
#5
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Year: 2000
Model: Cherokee
Engine: 4.0L
sounds like a loss of pressure somewhere in the system casuing the water to boil and run to the overflow. I had this exact same issue recently and it turned out to be pinholes in the rusted metal pipe that runs out of the water pump. I could see coolant pooling in the A/C compressor mount where it was spaying our under pressure.
#6
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Year: 1999
Model: Cherokee
Engine: 4.0L
Replace your radiator cap, they're like $5 at the most. When the spring wears out it allows the system to boil over much easier. Make sure you buy the correct PSI rated cap, I think it is 16lb for the 4.0.
Last edited by ornery owl; 08-28-2011 at 11:22 AM. Reason: boil over will give you the big temperature fluctuation like you described.
#7
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Year: 1998
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Engine: 4.0L HO
+/-$250 in parts replaces the entire cooling system (radiator, water pump, fan clutch, tstat, etc.). Replacing everything virtually eliminates the guessing and means u only have to drain/refill cooling system once.
Last edited by djb383; 08-28-2011 at 11:24 AM.
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