We have both the single speed Mark VIII fan and the 2-speed fan that came in the T-Bird during the same time period. Lincoln used the computer to control the speed of the single speed fan so it was basically a variable speed fan. My observations are that the single speed fan pulls more amps and definitely pulls more air at full voltage than the 2-speed. Maybe a moot point because the two-speed was in our Firebird and wired where the thermostat controlled low speed and a dash override switch would activate the high speed. In six years there was never a time even on the hottest days that the high speed was needed. The single speed fan in my drag car is controlled by a Flaming River variable speed controller and it has never had to go full tilt to keep temps cool.
Still prefer the total reliability of a manual fan setup on the street. Have friends with a wide variety of electric fans and controllers, and have kept several of them company alongside the road while they waited for the tow truck. Always a fuse or controller issue and never a fan motor failure.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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