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2017 3500 6.7TD thermostat replacement

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AH64ID said:
The fan starts to ramp at 97°C and this is the fan rpm vs temp table from a 2017.

It is strictly based on temp, load has nothing to do with fan rpms.

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My fan is audible around 1100 rpms, very noticeable at 1500, and 3000 sounds like a Cessna.
Click to expand...

Thanks John, this is great info for me. The fan in my truck never sounds like a cessna. sounds more like a glider.
 
cricha said:
yes, I believe I should hear the fan more often.

I have 66K on the engine, so I think the drivetrain warranty is still in effect. The closest dealer for warranty work is a complete train wreck. wouldnt even consider going there. The next dealer that has a good record is a ways away. Unless the issue is going to be real expensive, it costs me more out of pocket to have it serviced at a dealer. some things I cant do right now, such as the diagnostic programs. So I had to take it to a shop. I was concerned there could be something wrong in the software causing the problems. Shop price for a fan clutch was about $1100 bucks installed plus the added cost of having to have a second driver make two trips to the shop and back. it would be ok if the dealer would cover 100%
$35 for a t-stat delivered to my doorstep seems like a good place to start. Im looking at getting the alfaOBD program. just found out about it.
Click to expand...


I don't know how far a good ways it, but if you've never heard the fan from day 1 I would take it in to a dealership.

It should be covered under the 5/100K powertrain.

Since it hasn't worked since day 1 it could be a wiring issue too, or an ECM issue. It should set a code if it's the fan clutch.

It may be a PITA, but this time I highly suggest letting FCA fix it. Don't even bother with the thermostat.
 
AH64ID said:
It should be covered under the 5/100K powertrain.

Since it hasn't worked since day 1 it could be a wiring issue too, or an ECM issue. It should set a code if it's the fan clutch.
Click to expand...

not covered under the powertrain warranty. all on my dime.
Didnt discover this issue prior because we didnt tow anything until this year, and honestly, the truck never heated up.
according to the tech, no codes were set. but then again, I dont have a lot of faith in his operation of the diagnostic software.
appreciate the data table you posted. That is good ref info. THANKS!!
whatever the end result is, i'll post it.
 
Get a better tech, it seems the guys working on your truck are totally clueless.

Changing a thermostat when the ECM didn't call for the Fan to come on makes exactly zero sense.

Was the water an oil temperature monitored externally or by the lie-o-meters on the dash?

Last but not least - what temperatures do you expect to see from your unit?
 
AH64ID said:
Gates is not OEM.

Lots of people have good luck with gates, but I prefer Cummins thermostats... just don’t buy them from FCA. Go direct to a Cummins dealer or on the internet.
Click to expand...

Simply compare side by side. Gates looks like a toy.

Why do you want to replace it?
 
Did you ever get any more information about the programming for the engine fan? I’ve got an 18’ that does the exact same thing. Pulling 7k TT through NM and AZ this past August and water temperature 230 and oil temperature 240 and engine fan never came on. It would cycle with the a/c but never fully engaged. May have to take mine to the dealer since I still have the B2B warranty.
Fan clutch was replaced at 5189 miles because of clutch leaking grease out of it.
 
OLEJOE said:
Did you ever get any more information about the programming for the engine fan? I’ve got an 18’ that does the exact same thing. Pulling 7k TT through NM and AZ this past August and water temperature 230 and oil temperature 240 and engine fan never came on. It would cycle with the a/c but never fully engaged. May have to take mine to the dealer since I still have the B2B warranty.
Fan clutch was replaced at 5189 miles because of clutch leaking grease out of it.
Click to expand...
havent got any additional info yet on this, mostly because this covid BS has prevented me from getting my trailer on the road. The symtoms you are describing is EXACTLY what mine is doing. fan cycles w/AC , but doesnt engage when coolant/oil temps go way up. according to the charts that AH64ID posted (thank-you!!), I should be hearing the fan come on. Stumped.
 
I don't have an ESN for a '17, but Cummins doesn't offer the Fan Clutch for the '16 I looked up, so I guess it's Mopar only.

I looked up the 6.7's in our buses, and to my surprise, some of our '15's and all of our '16-'20 models have gone to a viscous clutch.

All that to say this, if the Fan Clutch for your truck is anything like the Cummins Fan Clutch on our '15's, it's going to cost you north of $900.00. I think I'd be taking it back to the dealer....
 
Almost absolutely not the t-stat, very little chance that is the issue.
Don't have the parameters on a 2017, but for my 2015 the clutch fully engages at 227 degrees and you definitely can hear it roar. Clutch engagement percentage is controlled by the ecm by pulse width modulation.
I'd say you need to try a different dealer and different tech to get a better diagnosis, replacing parts to try and track down the issue is not the way to do it.
And, I would call FCA customer care, they should be covering this under warranty.
 
AH64ID said:
Don't even bother with the thermostat.
Click to expand...

The sensor is in the engine for the fan. So if the engine is hot, even with a stuck shut T-Stat, the fan should be roaring. So the T-Stat is not the problem. Even if it was you would hear the fan, period.

The diagnostics for the fan are short a pin and wait 15 min for the fan to "do something". I have not seen newer tests and you can imagine how much stuff can catch fire in 15 min with no fan... Other than a code fans and fan clutches are hard to get fixed even ones that are leaking.
 
Labor and parts came to $535.00 if I remember correctly. It was on FCA. But I don’t think it’s the clutch. I think it’s in the programming in the ECM. May have to explore installing the viscous fan clutch. After the holiday I’m going to call my dealer and see if I can get them to look at it. They’re supposed to have an IT genius that’s the best in the state.
 
Well I don’t think it can be the fan clutch since it will engage when the head pressure gets up on the a/c and since it is showing the temperature. But I’m not sure that sensor is the one that sends the signal to turn the fan on.
The truck runs hotter with the a/c off.
 
Last edited:
Clutch engagement percentage is controlled by the ecm by pulse width modulation.
This is why I think it is programming.
 
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Issue 128 – Digital Version
Digital Magazines
FREE!
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Renew
Subscribe
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Back Issues
Subscription Status
Address Change Form
Buyer's Guides
Ram Diagnostic Trouble Codes
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What Makes Us Tick?
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