Question about Jeep Grand Cherokee

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I have a 2004 jeep grand cherokee. when the car runs for a short time 5-10 min. the coolant fan turns on and does not shut down until the car is shut off. plenty of antifreeze. what is keeping the fan from shutting down?

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  • Jeep Master
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Sounds like you may either have a thermostat that is not fully opening or a radiator that is partially obstructed (externally or internally). If I'm correct, what may be happening is that when the engine reaches operating temperature, it is continuing to get hotter but at the point you are at, the fans are able to compensate by remaining on.
Only other possibility is that the temp sender is bad and sending incorrect info to the computer, causing it to turn the fan on.
The concentration of antifreeze in a system does not change the operating temp. What it does is prevent the coolant from boiling at a temperature above what plain water would. Your radiator cap also helps with that as a liquid under pressure will boil at a higher temp. Proper concentration is 50/50. Normal operating temp is about 210 degrees(f). (+ ) (- ) 5 degrees)
So, I'd test the coolant sensor and replace the thermostat. Hopefully the radiator won't need to come out but you may need to have it checked if neither other options work.

Posted on Aug 04, 2010

  • Richard Scordino Aug 04, 2010

    Only thing I forgot to mention is to make sure that the mechanical fan is locking up when the engine gets hot.

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The fan will occassionally continue to run for five or ten minutes after the vehicle shuts down. This is normal.

What is not normal is if it keeps running until the battery drains.

Does it just keep running?
If it eventually shuts off, how long does it take?
Did this just start happening?
The two days you mentioned, were they short trips, opposed to the third day?

If you would comment me back with some more details, it would help me help you.

Mike

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