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Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 13559
Experience:  Jeep Certified Master Tech
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250-260 DEGREES AT 65-70 mph, LOOSES SOME POWER..THERMOSTAT..NO LEAKS

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RUNS HOT, 250-260 DEGREES AT 65-70 MPH, LOOSES SOME POWER. THERMOSTAT OPENING, TOP HOSE HOT, ENGINE HOT. NO LEAKS UNDER PRESSURE. RUNS GREAT, NO NOISE, COOLANT AND OIL LEVEL GOOD. 35 MILE TRIP ON HWY WILL PUSH IT TO 250 DEGREES, TURNED ON HEATER AND IT BACKED DOWN TO 240. SUSPECT "CLUTCH FAN".
APPRECIATE CONFIRMATION OF DIAGNOSIS OR SUGGESTIONS. THANK YOU, BOB
Submitted: 5 years ago.
Category: Jeep
Expert:  Chris replied 5 years ago.

Hello and welcome to just answer. This is probably not a fan clutch problem because when you are doing 65-70, there should be sufficient air flow through the radiator. If the fan clutch was failing, then your overheating problem would happen during stop and go type driving. This sounds more to me like a coolant flow problem, like a partially plugged radiator. It may also be a cylinder head gasket issue, but if you are not loosing coolant then it is probably not that. I recommend having the radiator flow tested and replaced if necessary. Also make sure that there are no blockages in the radiator fins preventing proper air flow.

I hope this information helps, and let me know if you need further assistance with this.

 

Chris

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