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Unread 06-30-2009, 09:45 AM   #1
blackrain
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Jeep XJ 1996 Auxiliary Fan Temp Sensor ?

My Jeep runs hot when idling on a hot day or when I'm pulling the boat. I feel my auxiliary fan turns on too late because it starts spinning at 220F. The fan however turns on regardless at any temp when I run the AC.

Should I replace the temperature sensor that turns on this fan or some actuator in the control unit? Where is it? Help?

I have also done a coolant flush and installed a 190F thermostat.

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Unread 06-30-2009, 09:49 AM   #2
XJdamyankee
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Well your fan is running normal, it's not suppose to come on until you hit 220 or whenever you turn the ac on. Your other options would be to put in an override switch for the fan so you can turn it on anytime plus if your pulling a boat I would strongly suggest you upgrade your radiator and install a trans cooler.
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Unread 06-30-2009, 11:01 AM   #3
CJ7-Tim
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215-218* is the normal temp for the E-fan to turn on.

If you are running hot you need to focus on the other parts of the cooling system. Is your radiator clogged with mud and bugs outside or mineral deposits on the inside ? Is your mechanical fan clutch working correctly ? How old is your water pump ? The vanes on the water pump can wear down and your coolant flow will be less than required. When was the last time you replaced your radiator cap ? Are your radiator hoses old and mushy and collapsing under pressure enough to restrict the coolant flow ?

Do you have an auxiliary transmission cooler installed as recommend when towing ?
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Unread 06-30-2009, 12:47 PM   #4
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wire that baby to a switch!
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Unread 06-30-2009, 12:57 PM   #5
MJR
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wire that baby to a switch!
Just wire it directly to the fan motor and don't even try to wire it into the relay coil side unless you want to buy a new PCM down the road.
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Unread 06-30-2009, 02:03 PM   #6
blackrain
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Just wire it directly to the fan motor and don't even try to wire it into the relay coil side unless you want to buy a new PCM down the road.
How do I do that. Wire the Fan motor to...? As long as it turns off when the car is off.



I bought my 1996 jeep a year ago. Has 102k on it. Other then a coolant flush and thermostat I have not changed any other cooling components. The radiator looks fine but then again I couldn't get a great look at it because the AC radiator is in the way. I'm hesitant to move it since the AC still works.
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Unread 06-30-2009, 04:01 PM   #7
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you might just need to get a new clutch for your clutch pulley fan. they don't cool as well as they should when they start to wear out.
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Unread 06-30-2009, 06:03 PM   #8
CJ7-Tim
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If your cooling system is working properly, you do not need to run the E-fan on a switch.

Service your cooling system, and replace any under-performing parts. Fix it right, and it will work right.

Install a transmission cooler.
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Unread 06-30-2009, 06:44 PM   #9
blackrain
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what does the clutch fan pulley do?

what components should i replace first? radiator, pump, (something else)???
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Unread 06-30-2009, 07:48 PM   #10
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Quote:
Originally Posted by blackrain View Post
My Jeep runs hot when idling on a hot day or when I'm pulling the boat. I feel my auxiliary fan turns on too late because it starts spinning at 220F. The fan however turns on regardless at any temp when I run the AC.

Should I replace the temperature sensor that turns on this fan or some actuator in the control unit? Where is it? Help?

I have also done a coolant flush and installed a 190F thermostat.
you have a worn out cooling fan clutch. $40, 30 minute fix. normal wear and tear item. your electric fan is working normally at on at 219'F and off at 207'F. it's a bit overworked if your main fan cltuch can't keep up, resulting in a "hot idle temp creep" at a red light.

you thermostat and temp sensor on the housing is correct. your dash gauge sensor near #6 cylinder is also good.
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Unread 06-30-2009, 11:04 PM   #11
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Quote:
Originally Posted by blackrain View Post
How do I do that. Wire the Fan motor to...? As long as it turns off when the car is off.
You'd wire in a separate relay to the battery and have the switched side get power from the ignition switch so it shuts off. The switched power out of the relay will go to the green (I think that was the color) wire on the fan to turn it on.
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