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  #1  
Old October 1st, 2016, 02:25 PM
JBOD77
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Jonathan
1995 D90 ST Beluga Black
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Fan clutch

I've long been curious if my fan clutch is working properly. With fall approaching I have some downtime so here's what I've found. Stock 1995 NAS with 3.9 V8. Engine off the fan can be spun by hand but it stops immediately and has no momentum or free spin. Cold start the fan engages with the start of the engine. Rolled up newspaper applied to fan immediately after starting truck and I can shred the newspaper if I want to. That fan ain't stopping for nothin. Am I correct that this is not how it is supposed to function? Shouldn't I be able to stop the fan upon starting the truck with little to no resistance?
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  #2  
Old October 1st, 2016, 02:44 PM
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Chris
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Sounds good. If truck is hot and you can stoop the fan with newspaper then it's time to replace.
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  #3  
Old October 2nd, 2016, 08:27 AM
JBOD77
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So it should run from the time you start the vehicle?? I thought it functioned like a thermostat and engaged when the vehicle was hot and shut off when the vehicle was cool??
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  #4  
Old October 2nd, 2016, 09:14 AM
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It will always run briefly at start up, then as necessary
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  #5  
Old October 2nd, 2016, 09:16 AM
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You should be able to stop it when it is not engaged. It needs to get quite hot to turn on and lock up.
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Old October 2nd, 2016, 05:34 PM
JBOD77
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Jonathan
1995 D90 ST Beluga Black
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So what I've described is how it is supposed to be? I'm not following
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  #7  
Old October 2nd, 2016, 05:51 PM
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Thats the way it is. If you want something different, rip out the fan clutch and install an electric unit.
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  #8  
Old October 2nd, 2016, 06:13 PM
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Quote:
Originally Posted by JBOD77 View Post
So what I've described is how it is supposed to be? I'm not following
No. you should be able to stop it when cold.
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  #9  
Old October 3rd, 2016, 08:20 AM
JBOD77
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So, it sounds like I've got a little project ahead of me..... anyone familiar with a write up on how to do the fan clutch that might be helpful. I've tried searching but can seem to come up with anything....
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  #10  
Old October 3rd, 2016, 10:17 AM
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There is nothing wrong with your fan clutch ... you just haven't tested it when it's supposed to be locked up.

When cold they tend to lock up for a bit ... you here this as more air whoosh from the engine bay.

As the vehicle warms up they unlock and you can stop it with rolled up news paper.

When the vehicle gets really hot they lockup .... this is when the temp gauge starts creeping up well past the middle. They are there to increase the cooling capacity when the engine is HOT

If your temp isn't creeping up it means you cooling system is working well.
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