GMC Fan Clutch

Many people live with the mindset that if an auto component is not complex, it is not impressive. While this may be true on most instances, one must not forget that the impressive performance of the complex auto parts would often depend on the performance of the much simpler parts. GMC engines, for example, are tough and powerful basically because of their complex and brilliant engineering. However, without the aid of the much simpler cooling fans and their components, it is simply impossible for the engine to perform at their best. Thus, the GMC fan and its various components are just as impressive as the engine of your GMC.

Now, here's another impressive fact about GMC fans: they regulate their speeds by themselves based on the needs of the engine! How is this possible? Through the GMC fan clutch. The GMC fan clutch is a viscous (fluid) coupling device that is connected to the center of the fan. Its main function is to regulate the speed of the fan relative to the engine's speed and temperature. As the temperature around the engine begins to rise, the fan clutch would engage the fan, causing it to rotate faster and cool the engine better. If the opposite is true, the clutch would partly disengage the fan, causing it to move slower and the engine to lose less energy.

As fluid couplings, fan clutches make use of certain types of fluids to engage and disengage the engine fan. The most common fluid used for such purposes is silicone oil. The torque-carrying capacity of silicone oil is the one that dictates the speed of the engine fan. So if there is a great amount of silicone oil in the coupling, the rotation of the fan would also be faster, vice versa.

Now, there are two general types of fan clutches used in vehicles today. The first would make use of a bi-metallic strip and control piston to regulate the amount of silicone that should enter the coupling. On the other hand, the second type of fan clutch would make use of a bi-metallic spring and an opening plate for the same function. In either type, the bi-metallic element in the clutch is heat sensitive, expanding and contracting with every temperature change. The expansion and contraction of this element allows the silicone oil to flow in and out of the coupling in regulated amounts, thus allowing the clutch to regulate the speed of the fan.

Fan speed regulation is very important for the proper cooling of a vehicle's engine. Without a fan clutch to perform such function, you can expect your GMC engine to overheat quite often. So if the GMC fan clutch of your vehicle is already damaged, better replace it at once with a replacement GMC fan clutch from Parts Train.

Featured Products

Fan Clutch

FAN CLUTCH -- Thermal design; Reversed rotation; 7.2 in. Overall Diameter, 0.63 in. Pilot Diameter / Thread Size, 1.03 in. Pilot Depth, 2.43 in. Flange or Hex Diameter, 1.63 in. Fan Mount Height, 3.25 in. Fan Hole Bolt Circle, 2.52 in. Fan Mount Diameter, 3.34 in. Overall Height; A high quality, direct fit OE replacement fan clutch; Covered by a 1-year unlimited mileage warranty.

Brand: Replacement
Type: Clearance

Fan Clutch

FAN CLUTCH -- Thermal design; Reversed rotation; 6.45 in. Overall Diameter, 0.63 in. Pilot Diameter / Thread Size, 0.63 in. Pilot Depth, 2.46 in. Flange or Hex Diameter, 1.63 in. Fan Mount Height, 3.25 in. Fan Hole Bolt Circle, 2.52 in. Fan Mount Diameter, 3.65 in. Overall Height; A high quality, direct fit OE replacement fan clutch; Covered by a 1-year unlimited mileage warranty.

Brand: Replacement
Type: Clearance

Fan Clutch

FAN CLUTCH -- Thermal design; Reversed rotation; 7.2 in. Overall Diameter, M30x1.5 Right in. Pilot Diameter / Thread Size, 0.7 in. Pilot Depth, 1.44 [36M] Hex in. Flange or Hex Diameter, 1.75 in. Fan Mount Height, 3.25 in. Fan Hole Bolt Circle, 2.52 in. Fan Mount Diameter, 3.47 in. Overall Height; A high quality, direct fit OE replacement fan clutch; Covered by a 1-year unlimited mileage warranty.

Brand: Replacement
Type: Clearance

Fan Clutch

HAYDEN FAN CLUTCH -- Severe-Duty Thermal Design, Reverse Rotation, 6.45 in. Overall Diameter, 0.63 in. Pilot Diameter, 1.63 in. Fan Mount Height, 3.25 in. Fan Bolt Circle, M10 x 1.5 Hole 4 Bolt And Nut Threads, Turns The Fan 80-90% Of The Shaft Speed When Engaged And 20-30% When Disengaged, Used With 2-1/2 in. Deeper Pitch Fans, Features Land And Groove Design With Up To 72 Square Inch Of Working Area, Larger Working Surface Provides Cooler Running And Longer Life Expectancy, And Thicker Body And Deep Finned Faceplate Dissipate More Heat, Can Be Used In Place Of Many Heavy-Duty Clutches, With Hayden's Limited 5-Year Warranty

Brand: Hayden

Fan Clutch

HAYDEN FAN CLUTCH -- Severe-duty thermal design, 6.45 in. overall diameter, M30 x 1.5 right in. pilot diameter, 1.75 in. fan mount height, 3.25 in. fan bolt circle, M10 x 1.5 hole 4 bolt and nut threads, reverse rotation; Turns the fan 80-90 percent of the shaft speed when engaged and 20-30 percent when disengaged; Used with 2-1/2 in. deeper pitch fans; Features land and groove design with up to 72 square inch of working area; Larger working surface provides cooler running and longer life expectancy and thicker body and deep finned faceplate dissipate more heat; Can be used in place of many heavy-duty clutches; With Hayden's limited 5-year/50,000 miles warranty.

Brand: Hayden