1978 GMC K25 Base 6 Cyl 4.8L Heavy Duty; With AC, Heavy Duty, With 3.42 Or Lower Rear Axle Ratio; Heavy Duty; Without AC; With 3.73 Or Higher Rear Axle Ratio
1978 GMC K25 High Sierra 6 Cyl 4.8L Heavy Duty; With AC, Heavy Duty, With 3.42 Or Lower Rear Axle Ratio; Heavy Duty; Without AC; With 3.73 Or Higher Rear Axle Ratio
1978 GMC K25 Sierra Classic 6 Cyl 4.8L Heavy Duty; With AC, Heavy Duty, With 3.42 Or Lower Rear Axle Ratio; Heavy Duty; Without AC; With 3.73 Or Higher Rear Axle Ratio
1978 GMC K25 Sierra Grande 6 Cyl 4.8L Heavy Duty; With AC, Heavy Duty, With 3.42 Or Lower Rear Axle Ratio; Heavy Duty; Without AC; With 3.73 Or Higher Rear Axle Ratio
Product Details
Notes : Clockwise rotationDesign : Heavy-duty thermalRotation : Clockwise (Standard)Quantity Sold : Sold individuallyWarranty : 12-month or 12,000-mile GMB limited warranty
1978 GMC K25 Base 6 Cyl 4.8L Severe Duty; With 3.42 Or Lower Rear Axle Ratio; Without AC; With 3.73 Or Higher Rear Axle Ratio, Severe Duty; With AC, Severe Duty
1978 GMC K25 High Sierra 6 Cyl 4.8L Severe Duty; With 3.42 Or Lower Rear Axle Ratio; Without AC; With 3.73 Or Higher Rear Axle Ratio, Severe Duty; With AC, Severe Duty
1978 GMC K25 Sierra Classic 6 Cyl 4.8L Severe Duty; With 3.42 Or Lower Rear Axle Ratio; Without AC; With 3.73 Or Higher Rear Axle Ratio, Severe Duty; With AC, Severe Duty
1978 GMC K25 Sierra Grande 6 Cyl 4.8L Severe Duty; With 3.42 Or Lower Rear Axle Ratio; Without AC; With 3.73 Or Higher Rear Axle Ratio, Severe Duty; With AC, Severe Duty
Product Details
Notes : Clockwise rotationDesign : Severe-duty thermalRotation : Clockwise (Standard)Quantity Sold : Sold individuallyWarranty : 12-month or 12,000-mile GMB limited warranty
1978 GMC K25 Base 6 Cyl 4.8L Optional Duty Thermal Fan Clutch; With 3.42 Or Lower Rear Axle Ratio; Without Ac; Severe Duty Thermal Fan Clutch; With 3.73 Or Higher Rear Axle Ratio, Severe Duty Thermal Fan Clutch; With Ac, Severe Duty Thermal Fan Clutch; With Hd Fan Clutch, Severe Duty Thermal Fan Clutch
1978 GMC K25 High Sierra 6 Cyl 4.8L Optional Duty Thermal Fan Clutch; With 3.42 Or Lower Rear Axle Ratio; Without Ac; Severe Duty Thermal Fan Clutch; With 3.73 Or Higher Rear Axle Ratio, Severe Duty Thermal Fan Clutch; With Ac, Severe Duty Thermal Fan Clutch; With Hd Fan Clutch, Severe Duty Thermal Fan Clutch
1978 GMC K25 Sierra Classic 6 Cyl 4.8L Optional Duty Thermal Fan Clutch; With 3.42 Or Lower Rear Axle Ratio; Without Ac; Severe Duty Thermal Fan Clutch; With 3.73 Or Higher Rear Axle Ratio, Severe Duty Thermal Fan Clutch; With Ac, Severe Duty Thermal Fan Clutch; With Hd Fan Clutch, Severe Duty Thermal Fan Clutch
1978 GMC K25 Sierra Grande 6 Cyl 4.8L Optional Duty Thermal Fan Clutch; With 3.42 Or Lower Rear Axle Ratio; Without Ac; Severe Duty Thermal Fan Clutch; With 3.73 Or Higher Rear Axle Ratio, Severe Duty Thermal Fan Clutch; With Ac, Severe Duty Thermal Fan Clutch; With Hd Fan Clutch, Severe Duty Thermal Fan Clutch
Product Details
Design : Severe-duty thermalReplaces OE Number : 22091721Quantity Sold : Sold individuallyWarranty : 1 year or 12,000-mile 4-Seasons limited warranty
1978 GMC K25 Base 6 Cyl 4.8L Optional Non-Thermal Fan Clutch; Without Ac
1978 GMC K25 High Sierra 6 Cyl 4.8L Optional Non-Thermal Fan Clutch; Without Ac
1978 GMC K25 Sierra Classic 6 Cyl 4.8L Optional Non-Thermal Fan Clutch; Without Ac
1978 GMC K25 Sierra Grande 6 Cyl 4.8L Optional Non-Thermal Fan Clutch; Without Ac
Product Details
Design : Standard thermalRotation : Bi-Directional (Standard and Reverse)Quantity Sold : Sold individuallyWarranty : 120-day 4-Seasons limited warranty
1978 GMC K25 Base 6 Cyl 4.8L Standard Rotation, Standard Duty Thermal Fan Clutch, Without Ac
1978 GMC K25 High Sierra 6 Cyl 4.8L Standard Rotation, Standard Duty Thermal Fan Clutch, Without Ac
1978 GMC K25 Sierra Classic 6 Cyl 4.8L Standard Rotation, Standard Duty Thermal Fan Clutch, Without Ac
1978 GMC K25 Sierra Grande 6 Cyl 4.8L Standard Rotation, Standard Duty Thermal Fan Clutch, Without Ac
Product Details
Design : Severe-duty thermalRotation : Clockwise (Standard)Quantity Sold : Sold individuallyWarranty : 1 year or 12,000-mile 4-Seasons limited warranty
Design : Heavy-duty thermalReplaces OE Number : 88961767Quantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warranty
Great fan clutch. Far easier to install than the old one that had holes instead of slots. Quick delivery too. Maybe more undesired email after the fact, but the part is great.
Main Components of Your Cooling System2. WATER PUMP: Draws the cooled anti-freeze from the radiator and pumps it through the engine block, cylinder head(s), heater core and back to the radiator.