Originally Posted by
tankradio2
Hello all. Am I missing something regarding the viscous coupling ? Mine gave out two or three years ago so I drove a self tapper through it and have been running it as a solid drive ever since. Does the viscous drive really do anything important or are we better off with solid drive here in the Australian heat anyway ?
Cheers
Phill
Mine has had it removed and a fixed fan added. My understanding is that as the engine heats up (excessively) the fluid in the viscous coupling "locks" or thickens so the fan starts to actually drive and pull air through the radiator. When not hot the fan just free wheels saving a little power, fuel and noise. When the viscous fails it free wheels even when the engine gets hot and does not pull air through.
With a fixed fan, it is operating all the time pulling air through (a plus) but for most of the driving we do a fan is not actually needed as the air flow through the radiator is enough (exceptions - traffic, 4wding, sand etc). So to drive a fixed fan energy is required from the engine and it can be noisy.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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