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TSB 07-05-97

High Coolant Temperatures Or Overheating With Snowplow Attached

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Date: Nov.14,1997

Models: 1994 - 1997 (BR) Ram Trucks

NOTE: THIS BULLETIN PERTAINS TO 1500 SERIES RAM TRUCKS RATED AT 6400 GVW AND 2500 SERIES RAM TRUCKS RATED AT 8800 GVW.

NOTE: also applies to those WITH plows and NOT AHD

Symptoms:

Engine overheats or exhibits high coolant temperatures during highway operation with a snowplow blade attached to the vehicle.

NOTE: THIS CONDITION CAN ALSO OCCUR ON VEHICLES THAT HAVE BEEN FITTED WITH SNOWPLOWS WITHOUT SNOWPLOW PREP PACKAGE AHD.

Discussion:

If a customer describes the above condition, perform the Repair Procedure.

Parts:

1    52028837AA     Fan Drive, Viscous

Repair:

This bulletin involves replacing the viscous fan drive with an improved part for snowplow applications.

NOTE: INSTALLATION OF THE IMPROVED VISCOUS FAN DRIVE WILL CAUSE THE ENGINE COOLING FAN TO OPERATE MORE OFTEN.

1.    Replace the fan drive with p/n 52028837AA. Follow the applicable procedures in the service manual for the vehicle you are working on.

2.    After installing the new fan drive, start the engine and operate it at 2000 rpm for 2 minutes to pump fluid into the new drive assembly.

Note:

New fan will operate more often than previous fan (different temperature sensitive fluid in the fan clutch.)

Policy: Reimbursable within the provisions of the warranty.


Several people have reported that this procedure helps cure overheating when towing.  Here is an example:

Subject:   DiRT: Fan Clutch Report
Date:       Tue, 08 Sep 1998 22:14:49
From:      Jim Jones <nt7t@sns-access.com>
To:          DiRT

TSB 07-05-97 addresses a replacement viscous fan clutch for models built prior to 4/25/97 that over heat with a snowplow installed.  The replacement clutch was suppose to operate more often that the standard clutch (different temperature sensitive fluid in the fan clutch).  Since my rig runs hot when towing up hills in excess of 6%, I thought that the replacement clutch (part # 52028837AA) might help my situation.

As usual the dealer was no help at all.  The CC customer number was a different story.  In about 10 minutes they were able to tell me that the replacement clutch would fit my 95 2500HD 4x4 with a 360 (gas) and that it would probably help me.  So back to the dealer.  The dealer was unable to identify the part number in the TSB although they were able to verify that the Portland, Or. warehouse had a whole bunch of them. The standard clutch was back ordered.  So back to CC customer number and so on.  After several phone calls and four trips to the dealer I had my clutch.

I tested the replacement clutch after I installed it using the test in the service manual.  It engages fully at 140 degrees.  This compares to a stated spec of 165 to 180 degrees for the standard clutch. The standard clutches that I have tested seem to be biased toward the 180 degree end of that range.  When the replacement clutch came on it came on hard with a nice roar.  No stuttering.

I was able to road test it last week on a trip down I-5 to Ashland, OR.  Only a few 3 mile 6% grades on that route but the outside temp was well over 90 degrees and I left the a/c on full blast. The engine temp went less than half way between the 200 degree mark and the max normal mark on the gauge (probably less than 220 degrees) When the fan came on it was positive and I could see it pull the engine temp down.

With the standard fan in 75 degree weather, I would have pulled those grades with the a/c off and would have reached the top with the temp gauge at max normal.

The best part...the replacement clutch is $148 as compared to $200 for the standard clutch.  BTW the same clutch seems to fit all engines (Cummins, 360, V-10).

I'm impressed so far.  But as in all things, I suspect that mileage will vary.

Jim Jones
nt7t@sns-access.com


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004