Fan Clutch Not Working? - Page 2 - Dodge Cummins Diesel Forum
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post #13 of 41 (permalink) Old 07-29-2019, 09:30 PM Thread Starter
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Fan clutch engagement parameters

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Originally Posted by steve05ram360 View Post
hayes was the one he mentioned...


mike, fan clutch test in the manual states it can take ip to 15 minute sor the fan to engage, seems like a design defect if it actually took that long but worth mentioning...

Was it Hayes or maybe a Hayden like this one (Hayden 3282)? https://www.haydenauto.com/en/ecatalog?year=2005 There's some speculation that Hayden might even make the OEM version.

I recall reading about the long wait time for the clutch to engage and had the same feeling. Seems like a poor design to let things keep heating up. I let it run for about 5-10 minutes at full operating temp, at idle, with AC on full blast. No engagement or fan roar. The ECM temperature thresholds to trigger fan engagement seem a bit high. Work stuff and an insurance claim has kept me from from further diagnostics today. We had a big storm here a few days ago that dropped a pretty big Ponderosa Pine on the house. Got it removed and now working on the estimate to get the roof repaired.


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post #14 of 41 (permalink) Old 07-29-2019, 10:02 PM Thread Starter
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That would be very handy

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Originally Posted by Dylanss180 View Post
If you have HP tuner module, you can see what the ECM is commanding for the fan vs what is actually doing. It is a very good diagnostic tool for other systems on your truck as well.
I don't have an HP tuner module. I also read that a bi-directional scanner will command fan engagement to verify operation. I'll be under my truck on a creeper with a multi-meter and a jumper wire. Old school baby!!!

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post #15 of 41 (permalink) Old 07-29-2019, 10:28 PM
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Quote:
Originally Posted by MDSWA View Post
Was it Hayes or maybe a Hayden like this one? https://www.haydenauto.com/en/ecatalog?year=2005 There's some speculation that Hayden might even make the OEM version.

I recall reading about the long wait time for the clutch to engage and had the same feeling. Seems like a poor design to let things keep heating up. I let it run for about 5-10 minutes at full operating temp, at idle, with AC on full blast. No engagement or fan roar. The ECM temperature thresholds to trigger fan engagement seem a bit high. Work stuff and an insurance claim has kept me from from further diagnostics today. We had a big storm here a few days ago that dropped a pretty big Ponderosa Pine on the house. Got it removed and now working on the estimate to get the roof repaired.
Ouch, sorry to hear about the tree! no one hurt?

yeah hayden, not hayes sorry, brain fart
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post #16 of 41 (permalink) Old 07-29-2019, 10:52 PM
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A replacement 98 ford diesel mechanical fan engages with no delays at 206F and your back to 195F in 30 seconds. The AC is always cool and no connector to worry about. A poor connection to the fan shuts down the AC as will a poor connection at the connector below the compressor. I had so many problems with the latter I hard wired it. There is a pressure sensor above the compressor with a connector that can also cause problems. Check for a low fan speed code.
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post #17 of 41 (permalink) Old 07-29-2019, 11:31 PM
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Quote:
Originally Posted by steve05ram360 View Post
hayes was the one he mentioned...


mike, fan clutch test in the manual states it can take ip to 15 minute sor the fan to engage, seems like a design defect if it actually took that long but worth mentioning...
I think it can take up to 15 minutes to finish the transfer of viscous fluid between chambers from fully disengaged state to fully engaged state.
During normal operation ECM will not jump from 0% to 100% engagement in one step.
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post #18 of 41 (permalink) Old 07-30-2019, 05:49 AM
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And I'm still thankful I went the Mod route, No guessing or wondering why it will or won't work. Almost 3 years and going strong with great AC, even at idle.
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post #19 of 41 (permalink) Old 07-30-2019, 07:06 AM
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Just being curious, how are you mod guys handle the fan clutch DTCs and CEL if there is any?

Years ago a did a mod on my big Bronco with a Taurus electric fan and noticed that it hurt the mpg and I didn't like it.
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post #20 of 41 (permalink) Old 07-30-2019, 07:23 AM
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Quote:
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No.
This is not true.
The safety valve on compressor should operate/open to release the excessive pressure.
I think the ECM also disengage the ac clutch. I just don’t have the pressure number with me now.
.
The high side pressure number is 460 psi.
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post #21 of 41 (permalink) Old 07-30-2019, 07:28 AM
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So far I've checked the plug and wiring. It's all there and hasn't been cut by the fan. When I get a few minutes I'l run an Ohm test on the plug to see it it checks out.
FSM, IMO is wrong, my fan never free spins 5 times.
For months had intermittent fan codes could not figure out. Ended up being connector had worn out just enough to cause issue, simply using trial and error bent pins in connector to get better contact and wired tied connector together to get tighter fit.
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post #22 of 41 (permalink) Old 07-30-2019, 10:27 AM
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Quote:
Originally Posted by PWong View Post
I think it can take up to 15 minutes to finish the transfer of viscous fluid between chambers from fully disengaged state to fully engaged state.
During normal operation ECM will not jump from 0% to 100% engagement in one step.
yeah but 15 minutes way to long, imagine climbing a grade with a load and needing it locked up.
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post #23 of 41 (permalink) Old 07-30-2019, 10:28 AM
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Quote:
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Just being curious, how are you mod guys handle the fan clutch DTCs and CEL if there is any?

Years ago a did a mod on my big Bronco with a Taurus electric fan and noticed that it hurt the mpg and I didn't like it.
disabled cel in hpt...
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post #24 of 41 (permalink) Old 07-30-2019, 10:30 AM
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This mod guy lives in the golden land of fruits and nuts. Passed smog test with two fan speed codes that don’t trigger a check engine light. If there is no check engine light they are not concerned with non emissions related codes.They no longer check for carb stickers on after market air cleaners. They do check for a functional grid heater and all other emissions related items. It is possible to find a smog station where the technician thinks he is god and invents his own rules. My small town tech drives a diesel.
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