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Testing a fan clutch? #4553223
10/24/17 03:46 PM
10/24/17 03:46 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,220
Houston, Texas
The shop thinks I need a new fan clutch because it wasn't speeding up and slowing down. It was 55 degrees outside that morning and I said it's probably not going to since it's not hot outside. I read on the internet that you can spin it by hand and if it stops almost immediately it was okay. Then I have another guy saying its bad because it continues to speed for like 5 seconds after I shut the engine down. Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.

Last edited by motor_oil_madman; 10/24/17 03:48 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Testing a fan clutch? [Re: motor_oil_madman] #4553233
10/24/17 03:52 PM
10/24/17 03:52 PM
Joined: Apr 2010
Posts: 4,739
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline

Joined: Apr 2010
Posts: 4,739
Storrs, Connecticut
You have to test it at operating temp. Get the engine to operating temp, shut it off, try spinning the clutch by hand and it should have a bit of resistance.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (38k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Testing a fan clutch? [Re: motor_oil_madman] #4553236
10/24/17 03:54 PM
10/24/17 03:54 PM
Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline

Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
On your Cummins? They're tough to gauge. Due to them being electronic, they do what they want when they want. Idling a diesel looking for the fan clutch to turn on is even tougher because they're not big heat shedders when not under load.

However, they can definitely under perform without giving any noticeable signs. I had no codes, no overheating, and no other noticeable symptoms other than occasionally crawling to 208, and failing to engage when my AC pressures got too high. Did perfect otherwise. Bad fan clutch.

When not engaged by the computer, it's going to act completely loosey goosey.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Testing a fan clutch? [Re: motor_oil_madman] #4553361
10/24/17 05:52 PM
10/24/17 05:52 PM
Joined: Jul 2014
Posts: 1,657
Canada
camrydriver111 Offline
camrydriver111  Offline

Joined: Jul 2014
Posts: 1,657
Canada
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.


BITOG or: How I Learned to Stop Worrying and Love the Extended OCI
Re: Testing a fan clutch? [Re: motor_oil_madman] #4553362
10/24/17 05:52 PM
10/24/17 05:52 PM
Joined: Sep 2007
Posts: 1,125
TX, USA
JMJNet Offline
JMJNet  Offline

Joined: Sep 2007
Posts: 1,125
TX, USA
May want to check with the Cummins forum/crowd?
This is more of a generic forum, not that there are not any Cummins experts/owners here but who knows.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Testing a fan clutch? [Re: motor_oil_madman] #4553404
10/24/17 06:36 PM
10/24/17 06:36 PM
Joined: Jun 2003
Posts: 18,425
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content

Joined: Jun 2003
Posts: 18,425
Deplorable in apple valley, ca
Those electric fan clutches on those Dodge trucks are junk! We replace them on almost every 07+ Dodge truck with a 6.7 we get in the shop. They have a huge failure rate.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Testing a fan clutch? [Re: camrydriver111] #4553530
10/24/17 08:25 PM
10/24/17 08:25 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.


Of course I checked it today and it was just idling, not speeding up and slowing down. Outside temp was 75


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Testing a fan clutch? [Re: motor_oil_madman] #4553619
10/24/17 09:37 PM
10/24/17 09:37 PM
Joined: Dec 2002
Posts: 42,625
New Jersey
JHZR2 Offline
Global Moderator
JHZR2  Offline
Global Moderator

Joined: Dec 2002
Posts: 42,625
New Jersey
Isn't there some trick to test with a roll of newspaper?

Re: Testing a fan clutch? [Re: jeepman3071] #4553672
10/24/17 10:24 PM
10/24/17 10:24 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Originally Posted By: jeepman3071
You have to test it at operating temp. Get the engine to operating temp, shut it off, try spinning the clutch by hand and it should have a bit of resistance.


It has resistance moving it by hand. If you shut the engine off it continues to spin, not sure if that means it shot also.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Testing a fan clutch? [Re: motor_oil_madman] #4553674
10/24/17 10:27 PM
10/24/17 10:27 PM
Joined: Sep 2015
Posts: 1,693
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,693
USA
The electric type will disengage when you turn the key off, because, well, it's electric.

Re: Testing a fan clutch? [Re: JHZR2] #4554048
10/25/17 10:51 AM
10/25/17 10:51 AM
Joined: Jun 2003
Posts: 18,425
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content

Joined: Jun 2003
Posts: 18,425
Deplorable in apple valley, ca
Originally Posted By: JHZR2
Isn't there some trick to test with a roll of newspaper?
not his electric one.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Testing a fan clutch? [Re: camrydriver111] #4554662
10/25/17 10:25 PM
10/25/17 10:25 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.



The guy at the shop thought it was bad because the ac pressure went to 400psi and he said the fan should have spun up because of that. Last I checked the fan really doesn't do much this time of year when it's only 65-75 degrees outside, usually I only hear the fan during during summer months. I've had this truck for 10 years now, so I would know. Just three weeks ago I remember it blowing the dirt off the ground when I was backing up 75 feet at 10mph with the trailer behind me. lol


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Testing a fan clutch? [Re: Chris142] #4554706
10/25/17 11:24 PM
10/25/17 11:24 PM
Joined: Aug 2006
Posts: 9,991
Central Washington
Colt45ws Offline
Colt45ws  Offline

Joined: Aug 2006
Posts: 9,991
Central Washington
Originally Posted By: Chris142
Originally Posted By: JHZR2
Isn't there some trick to test with a roll of newspaper?
not his electric one.

If you had a way of interrogating the computer and seeing when it called for it to be locked and then test and see that its actually locked? Would that work?


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 86k
Pennzoil Conv HM 5W30, Fram XG2
Re: Testing a fan clutch? [Re: motor_oil_madman] #4554775
10/26/17 01:55 AM
10/26/17 01:55 AM
Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline

Joined: May 2012
Posts: 6,158
Fort Lauderdale, FL
Originally Posted By: motor_oil_madman
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.



The guy at the shop thought it was bad because the ac pressure went to 400psi and he said the fan should have spun up because of that. Last I checked the fan really doesn't do much this time of year when it's only 65-75 degrees outside, usually I only hear the fan during during summer months. I've had this truck for 10 years now, so I would know. Just three weeks ago I remember it blowing the dirt off the ground when I was backing up 75 feet at 10mph with the trailer behind me. lol


Oh yeah. Typical. You better do something about that, or you'll start shooting AC system seals and hoses soon.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Testing a fan clutch? [Re: motor_oil_madman] #4555621
10/26/17 08:56 PM
10/26/17 08:56 PM
Joined: Nov 2009
Posts: 5,220
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,220
Houston, Texas
Typical of a fan clutch? Or something else?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

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