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Old 01-27-2014, 08:54 PM   #1
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Fan clutch question

I think that my fan is not working properly, and I was wondering if someone can explain how it should work.

I opened up the hood, and noticed the fan always turns. When I increase the RPM, the fan also increases, and it is very loud. The clutch seems to never "disengage" and become quieter. My temp gauge is just under the 100 degree mark all the time (Celsius because I think my jeep was built in Canada). The outside air temp is well below 0.
I also think its making a noise, kind of like a whining noise. Its hard to tell where it's coming from with that fan going.
Any thoughts? Its a 95, 4 liter engine.

Also, because it has running lights, a block heater, temp gauge in Celsius, I am assuming it was built in Canada. Do all YJ's have running lights?

Thanks!!!

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Old 01-27-2014, 09:55 PM   #2
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The fan always turns with the motor from centrifical force. The only time the fan will not turn is if the motor is off. The clutch you can check if the motor is off, try and move the fan. you should be able to turn the fan by hand. If it turns the clutch works.

What are you considering as running lights? marker lights on the sides of the fenders? A block heater is a common add on for the northern states, but I have never seen gauges in Celsius.

My 87 was built in Canada, as were a ton of the YJ's...CHrysler still has a plant up there now...Well, technically it's Fiat now...lol.

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Old 01-27-2014, 10:16 PM   #3
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Ok, I understand the fan will always spin unlike an electrical fan, I just thought that it would spin less/not as noisy sometimes.

By running lights, I mean headlights. As soon as I start rolling the headlights turn on.
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Old 01-27-2014, 10:40 PM   #4
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Oh ok, you mean daytime running lights, I have never known for that to be an option in a YJ, but its possible. You must have an automatic? I wouldn't know how it would get a signal to turn the head lights on other than the neutral safety switch on an automatic. Its probably a dealer added item...like air conditioning.
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Old 01-27-2014, 11:05 PM   #5
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Yes it could be dealer added, it does have a/c and it is automatic. I read somewhere that daytime running lights are required in Canada, and that all yj's built for them have it, along with a block heater from the factory. Cant find where I saw that info, may not be accurate anyway.

So anyways, I did move the fan by hand, there is resistance both ways. If its bad, should it not even budge? Does it matter if the engine is hot or cold?
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Old 01-27-2014, 11:15 PM   #6
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If the fan clutch were bad, you would either have a direct drive fan, in other words it wouldn't be moveable by hand or it would spin very free, like you can twirl it by giving it a push. The resistance means its working properly. It isn't regulated by heat.

Is your AC pump circulating that is causing the loud noise in the engine compartment? Sometimes the clutch gets stuck on those even if the switch on the dash isn't on. If the center of the ac clutch is spinning with the belt then its engaged. Shut the motor off and pull the electrical plug off the back of the AC pump. Its common if the Freon is low or if it gets iced up cause of the frigid temps we have been having.
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Old 01-28-2014, 05:51 PM   #7
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Ok just FYI, I replaced my belt and fan clutch today because it was only about 35$. The fan turns a lot slower, and is way less noisy, and doesn't spool up like the old one while the engine was warming up. The engine gets up to temp a little faster, and is less noisy while driving.

When I compared the two side by side, the old one had more resistance, so I think it was malfunctioning.
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Old 01-28-2014, 05:59 PM   #8
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Quote:
Originally Posted by 0III0forlife View Post
If the fan clutch were bad, you would either have a direct drive fan, in other words it wouldn't be moveable by hand or it would spin very free, like you can twirl it by giving it a push. The resistance means its working properly. It isn't regulated by heat.

Is your AC pump circulating that is causing the loud noise in the engine compartment? Sometimes the clutch gets stuck on those even if the switch on the dash isn't on. If the center of the ac clutch is spinning with the belt then its engaged. Shut the motor off and pull the electrical plug off the back of the AC pump. Its common if the Freon is low or if it gets iced up cause of the frigid temps we have been having.
The ac clutch noise went away. I have not heard it in a while. I think you are right on what was causing it. If I hear it again, I'll disconnect the ac compressor.

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