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07-28-2017, 02:15 PM
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#1
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Name: timesublime
Title: Compression Ignition
Status: Not Here
Join Date: Jun 2013
Location: Colorado
Member`s Gallery
Posts: 73
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Testing the viscous fan clutch
I think that my viscous clutch is not working anymore. Is there a definitive way to test the functionality of it? I read about testing the resistance between pins 1 and 2 on the unit. Any ideas?
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1995 4x4 rclb 47rh fully built s300g s472 5x14 024
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07-28-2017, 05:58 PM
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#2
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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Here is one way to check if it functions:
"Locate the electronically controlled viscous fan drive connector on the fan shroud, A spark may occur when the connection to battery is made. Using a jumper wire, backprobe pin 6 of the viscous fan drive connector to battery positive. The fan drive control coil is energized to 12 volts at this time. Run the engine at 2000 RPM, with scan tool watch fan speed until the fan speed increases to 1850 RPM or more for 30 seconds. It maybe takes 15 seconds before fan speed increases."
If you don't have a scan tool to watch RPM, you can still hear the fan start moving air if it locks up.
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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07-28-2017, 05:59 PM
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#3
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Name: Yotadzl
Title: Diesel Enthusiast
Status: Not Here
Join Date: Feb 2016
Location: Oregon
Member`s Gallery
Posts: 234
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I guess I should have asked what year the truck is first. That test is for a 2010-2012 Ram.
__________________
'85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun!
'95 Cummins grampa truck, embarrassingly stock
'12 Cummins, deleted
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07-28-2017, 06:56 PM
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#4
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Name: timesublime
Title: Compression Ignition
Status: Not Here
Join Date: Jun 2013
Location: Colorado
Member`s Gallery
Posts: 73
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2007.5
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1995 4x4 rclb 47rh fully built s300g s472 5x14 024
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07-28-2017, 07:13 PM
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#5
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Name: jesnic7
Title: Too Much Time
Status: Not Here
Join Date: Jun 2012
Member`s Gallery
Posts: 265
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According to the crowd that deems itself worthy of being released from society, they suggest that you just grab the fan while it is running, with the AC on, and try to stop it. If it stops, you found a bad fan clutch. Replace and move on with life until a better opportunity arises for you test your fate.
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07-28-2017, 07:16 PM
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#6
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,395
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I have a 2008 and noticed awhile back I don't hear the fan like I used to when towing. Also running 210 at times which is above normal for it, figured it was just hot as hell summer this yr. Interested in this
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07-28-2017, 07:18 PM
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#7
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,395
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Quote:
Originally Posted by jesnic7
According to the crowd that deems itself worthy of being released from society, they suggest that you just grab the fan while it is running, with the AC on, and try to stop it. If it stops, you found a bad fan clutch. Replace and move on with life until a better opportunity arises for you test your fate.
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Mine was strong enough to eat a cat last winter, guess thats good enough.
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07-29-2017, 12:36 PM
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#8
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Name: timesublime
Title: Compression Ignition
Status: Not Here
Join Date: Jun 2013
Location: Colorado
Member`s Gallery
Posts: 73
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Quote:
Originally Posted by jesnic7
According to the crowd that deems itself worthy of being released from society, they suggest that you just grab the fan while it is running, with the AC on, and try to stop it. If it stops, you found a bad fan clutch. Replace and move on with life until a better opportunity arises for you test your fate.
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Yeah. No. Lol. 15 hp turbine of death.
__________________
1995 4x4 rclb 47rh fully built s300g s472 5x14 024
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07-29-2017, 03:57 PM
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#9
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Name: Tobin
Title: 5.7 IDI Powaa!
Status: Not Here
Join Date: Oct 2008
Location: Oviedo, FL
Member`s Gallery
Posts: 1,496
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Turn the A/C on full blast. It should kick on and off noticeably sitting still idling.
__________________
2006 Dodge 2500 QCLB 4x4 Goerend 48RE
1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs
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07-29-2017, 04:06 PM
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#10
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,395
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I do hear that, thought it was the compressor cycling.
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07-29-2017, 04:27 PM
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#11
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Name: bnold
Title: Cummins. What else?
Status: Not Here
Join Date: Jul 2007
Member`s Gallery
Posts: 140
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Testing the viscous fan clutch
My 2011.5 was awful running ac with the motor cold when new. 100 degree day, remote start, run 15 minutes and the ac would be blowing 100degrees.
Compressor cycling rapidly due to high head pressure (low flow across condenser)
Many trips and videos to local stealer, 2 fans clutches of same part number, and finally got them to replace fan clutch with a different part number (TSB didn't include my VIN, but obviously same problem)
On a cold start, regardless of ambient temp, I could hold the fan from turning with my pinky finger with ac running.
Never another issue after fan replacement.
__________________
2011 Ram 3500 CCLB SRW
Last edited by bnold; 07-29-2017 at 04:28 PM.
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07-29-2017, 08:21 PM
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#12
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Name: lightsOUT
Title: Too Much Time
Status: Not Here
Join Date: Jun 2006
Location: saylorsburg, pa
Member`s Gallery
Posts: 1,515
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Quote:
Originally Posted by bnold
My 2011.5 was awful running ac with the motor cold when new. 100 degree day, remote start, run 15 minutes and the ac would be blowing 100degrees.
Compressor cycling rapidly due to high head pressure (low flow across condenser)
Many trips and videos to local stealer, 2 fans clutches of same part number, and finally got them to replace fan clutch with a different part number (TSB didn't include my VIN, but obviously same problem)
On a cold start, regardless of ambient temp, I could hold the fan from turning with my pinky finger with ac running.
Never another issue after fan replacement.
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That's exactly how my 12 is. It WILL NOT blow cold until the engine is full operating temp. The compressor will cycle constantly but only for a second or two.
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Robert
the dark side made me do it.........
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