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I was having terrible trouble out of my 6.5. I would be cruising down the road and all of a sudden the truck would go from 55 to 30 in a second and would sometimes almost put me through the windshield! I called several GM mechanics and diesel garages and...
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From: Travis H.
Was given a new PDM when I bought the truck but did 15K miles before I changed it. Bought the Heat Sync and #9 resistor to do the job. Apparently the PDM was a lot worse than I though because the truck runs like a jet now and I haven't even done the 50...
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From: K3 Chris
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6.5TD C/K Trucks  >  Cooling System Upgrades & Components  >  6.5 Turbo Diesel Cooling Fan Upgrade (early)

SSDiesel SupplyTM 6.5 Diesel to Duramax Fan Conversion 1992 thru 1999-1/2, C/K trucks, subs and G vans

6.5 Turbo Diesel Cooling Fan Upgrade (early)

6.5 Turbo Diesel Cooling Fan Upgrade (early)

Model: ssd-002 $285.99
United States and Canada - All Deliveries to the United States and Canada will be made by UPS. You will be quoted the shipping cost and presented with delivery options at the time of checkout. See our shipping calculator for more information.
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Brand new massive 21 inch GM Duramax HD cooling fan with special fan clutch which will adapt the Duramax high volume fan for serpentine belt driven 6.5 Turbo Diesel thru 1999 with flange-mount type clutch (as pictured) in C/K and G  vans. (excluding motorhomes & H1's) Also available for all 1999 1/2 - 2002 screw-on mount type clutch (additional fee) see our products page. From SSDiesel SupplyTM, the 6.5TD specialists.

Replace your inefficient 8 or 9 blade 20 inch stock fan and tired fan clutch with the massive/aggressive-pitch 21 inch Duramax fan and brand new clutch for less money then just a new fan clutch alone! This blade is the same GM part as used on all Duramax diesel engines. The clutch is a HD made in USA unit modified to adapt the Duramax fan to the 6.5 TD water pump, and engagement is approximately 15DF sooner then your stock clutch for better cooling.

This fan really sucks! Just stand in front of the grill, it will almost pull you in! It will not hurt mileage as the clutch only engages it when necessary. A must for towing, but highly recommended for all 6.5's to prevent overheating, which we all know are prone to. This fan alone makes a big difference in temperature, but in conjunction with our '97 cooling system upgrade, will keep your diesel super cool and prevent the common problem of head cracking. Summer is here, now is the time to get it ready for the heat!

The factory fan shroud will not need trimming in most applications, but some will need a trim of about a 1/2 inch. Very simple to do. Takes only minutes to install. Buy from the experts on GM 6.5 TD's.

180 degree thermostats are required for this fan to work properly. We have them available in this category for all year 6.5's.

Note: Will not work on early V-belt applications due to the CW rotation of the water pump. Requires CCW rotation (serp belt) water pump.

Our Special Thermal Fan Clutch...

  • Varies the fan speed with temperature of the air behind the radiator.
  • Engaged (high speed) operation provides maximum cooling.
  • Disengaged (low speed) operation provides fuel savings and noise reduction.
  • Greater life expectancy than a non-thermal clutch.
  • Briefly engaged at cold start-up.
  • Engages at 180DF AIR TEMP (NOT coolant temp) which is about 15 degrees cooler the OEM.


The air temperature coming through the radiator is sensed by the bi-metal thermal spring on the front of the thermal fan clutch. It expands and contracts with the change in air temperature operating a valve inside of the clutch. When cold, the silicone drive fluid is pumped from the working area to the reservoir. When hot, the valve opens allowing fluid from the reservoir to be transferred to the working area thereby increasing the fan speed. The clutch disengages as the air temperature decreases, closing the valve and allowing the silicone fluid to be pumped back into the reservoir.

A thermal fan clutch is engaged on a cold startup because the fluid drains into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as a result of a pumping action produced by a difference in speed between the shaft and the body of the clutch.

Our Special Clutches are specifically designed to engage at lower temperatures than the original equipment parts that they replace.

NOTE: for use only on the vehicles and applications listed above. Use on any other vehicle or application is at your own risk. May not work on Motorhomes.

6.5 Turbo Diesel Cooling Fan Upgrade (early)

 

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