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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Cooling Upgrade for Aux Fans for Early W463 Gs
I just ordered one of these for the 500GE. An Auxiliary Fan Modification.
This item is called the "cool harness".
It is a new plug with a resistor wired in that causes the auxiliary fans mounted in front of the condenser/radiator to turn on much sooner...In my case, I ordered the recommended 92 degree turn on "cool harness".
I will install this and report back. There are many happy customers all over the world for this neat product.
Thanks to the W126/W140 crowd for this idea....Now applying it to the W463.
For those of you with G300s or G320s, this should work as well.
Take a look here / You can order from here: http://www.k6jrf.com/MB_S500.html
I ordered the CH-92 for the 500 GE.
Edited by H1LM002G55 4/18/2013 4:59 PM
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AGuess
Elite Veteran
Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 717
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
I am very interested in this. Please post when you have tried it out.
Thanks for the info.
AGuess |
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
Will do. |
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
I installed the cool harness (takes less than 1 minute to install) and ran the 500 GE this weekend on the turnpike and on I-95.
It seems to keep engine water temp about 5 to 8 degrees cooler than before.
A definite improvement. This is the first time I have had it at speed for a prolonged distance, but so far, it is working as described.
Will do a little more testing. It is only $80 or $90 USD, but if it continues to perform this way, I will be very happy.
The outside temp as displayed in my dash cluster was 28.5 degrees Celsius, so certainly summer temps for S. Florida.
Enclosed: Picture of "CH-92" Cool Harness which causes condenser auxiliary fans to turn on at 92 Degrees Celsius.
This applies to the 2 valve M117 V8 engine, as fitted to my 500 GE / 500GE.
The Cool Harness is available for other Mercedes engines and models, including the G300 and G320.
To order, and for more information, visit: http://www.k6jrf.com/MB_S500.html#MYCH
Edited by H1LM002G55 4/29/2013 10:41 AM
 (CoolHarness.jpg)
Attachments
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 CoolHarness.jpg (474KB - 5 downloads)
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Otiswesty
Administrator
Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3004
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
Interesting, I noticed a big difference between the 2002 and 1999 G500 with respect to the cooling fans. On the 2002, the fan seemed to come on quite early, especially with the AC on. In the 1999, the fans almost never come on. I thought the fans might be dead on the 1999 so I switched them over between trucks before I sold the 2002. There was no difference in either truck, and the two auxiliary fans look identical for both the pre2001 and later G500.
I looked over that site noted above and did not see anything for the M113 motor, but it may be possible to just use a later model G500 CTS to the fan.
A few weeks after putting my 1999 truck front end back together, I was driving in 108 degree temps in Hells Canyon with the AC blasting and towing my VW Bus with 4 passengers, gear and 2 dogs. Temps never got over low 90's on the coolant temp guage. I was thinking a aux fan setup like the 2002+ would help the AC to run a little colder, but that may be more related tomy use of a used MB condensor replacement part. |
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
My observations-
I can't believe how quiet the condenser fans are on the 500GE....They seem to run at a very low RPM as well.
I had Renntech tune the G55...which included the ECU upgrade. I never noticed the condenser fans until after the ECU upgrade. They seem to come on much more frequently now. They are LOUD and there is no mistaking them turning on. They seem to be much more powerful (in terms of CFM flow rate) and they seem to run at a much higher RPM compared to the 500 GE.
One of my thoughts was, down the road, to see about switching over the condenser fans on a MB USA truck to the 500 GE for even better cooling...
I know AMG had issues with shoe-horning the 2 Valve V8 into the enclosed G engine bay and getting it to cool effectively.
I think I need to replace my coolant temperature sensor first. I thought the 500 GE was running a tad warm at just under 100 Celsius for water temp at highway speeds but I pulled over and used an IR thermometer and did not see temps over ~ 192 degrees Fahrenheit at various places that I measured over the entirety of the cooling system...These coolant temperature sensors are only $20 USD and are known to fall out of calibration with time and age...
Edited by H1LM002G55 4/29/2013 11:31 PM
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sps
Veteran
Date registered: Oct 2007
Location: "G" is in the DC area
Vehicle(s): 2000 G500 Cabriolet plus others
Posts: 236
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
Gents,
I went to the cool harness site and he makes a new version for the G500. Problem is I can't tell if it fits the circa 2000 G500, and he doesn't know either. It was designed for 1995 to 1999 3 valve S500 (and all other MB with a 4 pin sensor). My guess is that its the same. Anyone with knowledge of these things mind clicking over to his site and opining whether its fits the G?
http://www.k6jrf.com/MB_S500.html
Thanks.
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
I believe it is the same. (I know, necro-post, but wanted to answer the question).
The Cool Harness is working great and I am so pleased with it.
Note: My 500GE electrical auxiliary fans were probably running slow because they were dead from age (nearly 25 years old). Replaced both fans and they seem to have much more oomph now! Electric auxiliary fans are likely a part with a lifecycle of 5 to 7 years at best. |
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Aircruiser
Extreme Veteran
Date registered: Aug 2011
Location: Atlanta GA
Vehicle(s): 2000 G500, 1986 300GD, 2017 Porsche Cayenne Hybrid
Posts: 364
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
It's curious that this was dug up, As I was having some aux fans running with key off in my 2000 G500. After testing my coolant temperature switch I have determined it to be faulty. 98c/112c 4635450724 $70 is installed currently. A MB replacement part is on order from Europe. Interesting that the temperature switch looks like a TS-377 for VW Jetta to eurovan available for $10 from various manufacturers with various fan on temperatures and compressor off temperatures. I may pick one up for testing purposes.
I have also ordered a new run on cooling relay for good measure as the part number has been superseded with a 461 number.
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gerryvz
Extreme Veteran
Date registered: Apr 2014
Location: Annapolis, MD
Vehicle(s): 1994 G320, 1989 560SEC, 1994 E500 (W124)
Posts: 336
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
The Cool Harness is a "Band-Aid" for cooling systems that are not running up to spec. Basically they lower the threshold by where the secondary aux fan is tripped, and make it run much more of the time to keep things cool.
This means that in hot weather, the aux fans are running pretty much all of the time, which is a noisy proposition.
If the cooling system is running up to par/spec, a Cool Harness is not needed in any way. I know a lot of people have used them with great success, but again it is a Band-Aid that masks the fact that the system isn't operating normally.
If a radiator is known good, along with thermostat and water pump (bad impellers inside the pumps are often a cause of problems, which is out of sight, out of mind for most folks), then usually the visco fan clutch is the issue.
There is no more efficient way to throw more CFM across the radiator than a visco fan clutch that is working properly. I had to replace the fan clutch on my G320 shortly after getting it. When I sit in hot Houston traffic (say, at a stop light) the temp gauge creeps up to the 100C hash mark, but immediately calms down to the 85-90 mark when the truck is moving. The old/weak fan clutch allowed temps to get up to the 110-115C area, and even crack 100C when running down the road. So, an effective fan clutch will play a huge role in moderating temperatures. With older engines, when the clutch is not flowing air back through the radiator, it is natural for temps to climb a bit when the vehicle is not moving.
Of course, the Aux fans should be kicking in, as well. The first-stage aux fan should always be on when the A/C is running. The second-stage aux fan should kick in when the temps reach I think the 107-110C area (I'll have to check on that exact trigger point). And this "second stage" aux fan is what the Cool Harness makes run at a lower temperature. There are several versions of the CH available with different trigger points.
This has all be extensively discussed on my forum in probably 10-12 threads, along with peoples' experiences with the CH. A few representative threads:
http://www.500eboard.com/forums/showthread.php?t=226
http://www.500eboard.com/forums/showthread.php?t=4406
http://www.500eboard.com/forums/showthread.php?t=1161
http://www.500eboard.com/forums/showthread.php?t=1315
http://www.500eboard.com/forums/showthread.php?t=1366 |
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H1LM002G55
Expert
Date registered: Mar 2010
Location: S Florida / Geneva / Jeddah
Vehicle(s): 500 GE, G55, LM002, H1
Posts: 1796
| Re: Cooling Upgrade for Aux Fans for Early W463 Gs
1. I never hear my Aux Fans on the 500GE to be honest and I have excellent hearing.
2. The Cool Harness is a popular upgrade done by Jono and other knowledgeable MB Mechanics
3. I never had "over heating issues" where I saw water temperatures go over 100 Celsius. In heavy traffic and when moving slowly during summer, I would see temps rise...my cooling system was very clean. I did Tstat and flush first and ran water wetter. I then put in a new AMG fan clutch / visco clutch.
I still saw similar temps in hot weather with slow traffic. I changed thecoolant temp sensor thinking it was faulty after measuring water temp in my overflow tank and realizing it was significantly cooler than the water temp gauge was indicating.
4. After changing out both aux cooling fans I am now back to water temperature indicating at 85-90 Celsius on my water temperature gauge.
5. I think the cool harness helps, but more importantly, I think there is a cooling ecosystem where the fan clutch, thermostat, auxiliary electric cooling fans, and radiator health must all be working and in good order.
Note: I had a condenser leak which also impacted my cooling fans from turning on (my auxiliary electric cooling fans) when the freon level went low.
Also, a transmission oil cooler line leak I believe impacted the cooling ability of my transmission oil cooler. After cleaning that out, along with rinsing my radiators with water and Dawn soap, I noticed cooler temps.
Bottom line: Many of our G-Class models are 20 years old. Your fans may still turn on but they are likely not working at optimal intended efficiencies. Replace them.
Edited by H1LM002G55 5/17/2017 9:35 AM
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