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Old 06-14-2019, 05:26 PM   #1
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Fan Clutch, replace from top side?

I had overheat issues while coming home yesterday. See my other post overheat > 55 MPH...

Checked CAC from below between fan blades, looked clean, no clogged tubes.

Call Freightliner customer service gave him the description of the problem and asked about fan clutch. There is a 5A Fuse labeled fan CL just below the fan clutch relay in the fuse block in the rear compartment. I pulled the fuse while it was running and the clutch did not engage, fan did not change speed.

Has anyone replaced clutch from hatch under bed?
I can see the 4 spline bolts that mount the fan clutch assembly to the water pump. My question is has anyone cut the shrode and gotten the fan/clutch assembly up through the top?

Or do I need to pull radiator, CAC to get full access from the back?

Thanks,
Ed
2012 Winnebago 36M
Freightliner XCL chassis, ISB engine
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Old 06-14-2019, 05:45 PM   #2
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I replaced mine in the parking lot at a truck stop. Did not remove the radiator, however could not access from under bed, you should have another panel (I did) in your closet, that is where I had best access, that was directly over top of fan.

For what its worth, Spartan had me remove the fan clutch all together and mount fan directly to flywheel, they had to send me a spacer to make up the distance that fan clutch used to take up. The spacer was actually from Cummins when it arrived.

Highly recommend removing the fan clutch, my rig runs a lot cooler with out the clutch. Used to drive me nuts watching temp climb, then fan kick on, watch temp drop, then fan shut off, then temp climb again, then fan kick on, rinse repeat. Now temp stays constant and a very stable temp.
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Old 06-14-2019, 05:46 PM   #3
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mechanical fan rear radiator correct, there is no fuse for a mechanical fan
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Old 06-15-2019, 06:43 AM   #4
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Quote:
Originally Posted by erstanfo View Post
I had overheat issues while coming home yesterday. See my other post overheat > 55 MPH...

Checked CAC from below between fan blades, looked clean, no clogged tubes.

Call Freightliner customer service gave him the description of the problem and asked about fan clutch. There is a 5A Fuse labeled fan CL just below the fan clutch relay in the fuse block in the rear compartment. I pulled the fuse while it was running and the clutch did not engage, fan did not change speed.

Has anyone replaced clutch from hatch under bed?
I can see the 4 spline bolts that mount the fan clutch assembly to the water pump. My question is has anyone cut the shrode and gotten the fan/clutch assembly up through the top?

Or do I need to pull radiator, CAC to get full access from the back?

Thanks,
Ed
2012 Winnebago 36M
Freightliner XCL chassis, ISB engine
I replaced the clutch in about an hour and a half...but with the shroud cut. Made an opening of about 5"x7" initially to help me clean the CAC and radiator, but it worked great for access to the clutch.

I covered the hole with a piece of sheet metal duct work lined with heavy rubber weatherstripping and screwed back to the shroud.

Best of luck on your repair.
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Old 06-15-2019, 06:45 AM   #5
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Quote:
Originally Posted by Skiddy View Post
mechanical fan rear radiator correct, there is no fuse for a mechanical fan
Um yeah...there is a fuse for the electric fan clutch.
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Old 06-15-2019, 10:04 AM   #6
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Cool

Oh and just a side note:
Take old sheets or something and line the bottom of the engine area to stop your dropped wrenches/sockets/etc falling into the fan shroud area.

I didn't at first, and had to take a heavy magnet on a string to retrieve that wrench and socket.
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Old 06-15-2019, 01:48 PM   #7
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When the fan clutch loses power it's supposed to go into default high speed mode all the time. It's when power is applied to the clutch that it goes to idle or low speed mode. If yours is not locking into high speed mode without power, then it's probably lost all of the viscous fluid and a replacement is your next move. Mine has been replaced twice and both times it was not necessary to remove the radiator.
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Old Yesterday, 04:30 PM   #8
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M10 spline wrench?

Any idea where to get an M10 spline wrench crows foot to break loose the clutch bolts from the pulley? Mine just brent. There is not enough distance between the 2" clutch nut and the bolt heads to get a regular spline socket.
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Old Yesterday, 04:36 PM   #9
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Quote:
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Any idea where to get an M10 spline wrench crows foot to break loose the clutch bolts from the pulley? Mine just brent. There is not enough distance between the 2" clutch nut and the bolt heads to get a regular spline socket.
Hmmm...sorry. Yours must be different. I didn't use special tools. 12pt box wrench I guess.
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