Back 67-79 CLUTCH FAN CLUTCH THERMAL

Four Seasons products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Four Seasons.

Features & Benefits

• Designed, tested, and built by application.
• OE performance, fit, and appearance.
• Out of box installation.
• Precision machined.

Thermal Fan Clutches have a thermostatic valve which allows hydraulic fluid to bypass the clutch plate when necessary. As the engine temperature varies, the valve will open or close as needed to maintain proper speed of the fan. Because the clutch engages or disengages when needed, it maximizes fuel efficiency, brings the engine to optimum temperature faster, and typically lasts longer than a non-thermal clutch.

Non-Thermal Fan Clutches do not have the thermostatic valve. Instead, the clutch is linked to the water pump's shaft and is always engaged. Non-thermal clutches typically cost less than thermal clutches, so they tend to be a cost-savings alternative for standard duty thermal clutches. However, given they're always engaged, they are not as fuel efficient, cannot bring the engine to optimum temperature as quickly, and tend to have a shorter life expectancy. If your vehicle was originally equipped with a Heavy Duty Clutch you cannot use a Non-Thermal Clutch as a replacement.