Thermal clutch: The rate at which the fan spins is not the same as the water pump's shaft. The speed of the fan is directly proportional to the heat of the motor & the water pump's shaft. Hence the "clutch" part. Laymens terms: It slips and doesn't spin as fast while the motor is cold... then spins more as the motor heats up.
Non-thermal clutch: speed is directly coupled to the water pump's shaft.
The latter is usually cheaper and will not wear out of time. The thermal will (like any slipping system) begin to slip more over time and you loose efficiency and cooling ability.
however, living in a cold place (get's pretty cold up there 'ey?) the thermal-clutch fan is preffered, as it allows your motor to come to operating temperatures sooner.
Besides, when they built these cars some brainiac thought up this thermal clutch for a reason. [img]smile.gif[/img]
That'll be $10 (american) [img]graemlins/thumbsup.gif[/img]
member number 684
71' coupe project:
goal: 150+MPH, 9s driven to and from track, 275 front tire, 315 rear tire, 1000+HP
Build: 540cid, twin turbo, 4L80e, ...wait for it...
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