Question about 1999 Jeep Grand Cherokee

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I HAVE A ELECTRIC FAN PROBLEM WITH MY GRAND CHEROKEE 1999.

THE ELECTRIC FAN NEVER WORKS, I HAVE CHECKED THE RELAY AND FUSES AND THE ELECTRIC MOTOR AND EVERYTHING IS OK. I DO NOT KNOW IF IT HAS TO WORK
WHEN THE AIR CONDITIONED WORKS OR WHEN THE ENGINE
TEMP COMES UP OR NEED BOTH CONDITIONS, ALTOUGH THE
ENGINE TEMP DOES NOT HAVE PROBLEMS AND WORK FINE
WITH THE CLUTCH VENT I THINK THE ELECTRIC FAN IS IMPORTANT AND WOULD SHOULD WORK. COULD YOU HELP ME WITH SOME TIPS. THANKS

Posted by on

  • jaime_lopez Jun 16, 2009

    OK, THIS MIND THE ELECTRIC FAN FUNCTION DEPENDS ONLY OF THE ENGINE TEMP. IS THIS TRUTH?

    AND IF IT IS, THE ENGINE HAS A TEMP SENSOR IN THE ENGINE TO SEND ENERGY TO THE ELECTRIC MOTOR WHEN THE ENGINE TEMP COMES UP . WHERE CAN I FIND THIS SENSOR? AND EXACTLY WHERE IS THE TERMOSTAT (WHAT HOSE)?

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  • 986 Answers

This seems like your not over heating, looks like everything is functioning properly. You would need bring your engine temp up to get it going. Check your thermostat to ensure it is fuctioning properly. It may be stuck open not allowing enough heat build up to activate the fan. Good Luck

Posted on Jun 16, 2009

  • Roger Campbell
    Roger Campbell Jun 17, 2009

    The Thermostat will be on the top hose from the radiator to the engine block. There will be a round looking cap on tyhe top of the block.

    The relay is under the left front light from what I can tell in my books.



    There is generally a thermal sensor switch located on the radiator, most often near the bottom, (but it may be in one of the water galleries on your machine) this usually operates in the region of 85 degs C, this then normally would operate the fan relay which in turn operates the electric fan.


    There is generally a second electric fan associated with the airconditioning system, don't confuse which fan is which, the A/C fan should run most times when the A/C is functioning and is not as powerful as the engine cooling fan.

    Most often the thermal switch is the problem when vehicles overheat, (provided that the system and thermostat is otherwise operating properly) I would suggest examining the thermal switch system urgently.


    I generally identify which switch / sensor is involved and remove and place it in a saucepan of hot water with a meter lead attached and carefully ensure it is operating before the water boils.
    Generally the fan switch / sensor only grounds a current path to operate the fan relay.

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