'66 Fan Clutch

[66 Eldo]

My '66 appears to have the original engine fan but it is a solid fan and not equipped with a fan clutch. I used to have a '64 and numerous 69s and 70s which all had them. Could a '66 come with either type?

["Cadillac Kid" Greg Surfas 15364]

For 1966 the heavy duty cooling system came with a 7 bladed fan.
Greg Surfas

[Andrew Armitage]

My '66 Fleetwood 75 has one of those 7 bladed fans without a clutch.

[Alan Harris CLC#1513]

My 1973 Master Parts Book shows fan clutches up through 1964, none for 1965-1966, and then shows them again for 1967 and up except for Commercial chassis.

Based on this, I don't think any 65 or 66 came with a fan clutch.

[Jason Edge]

Per 1965 shop manual, all 1965 body styles had the 7 bladed non-clutch fan. Late in the 1964 production year the 5 bladed clutch fans found an 62 & 63 series AC equipped fans were replaced with the 7 bladed fan similar to the one already found on the 75 series and commercial chassis body styles (in 1963 & 1964 non-AC cars use a 4 bladed non clutch fans that went through a couple of design changes).  Per Serviceman Bulletins, for 1964 they had done a trial run of the 7 bladed fan for Engine Unit Numbers 095092 thru 096419 and switching over for remainder of the year after Engine Unit Number 116,400.

I guess for 1965 and 1966 they decided to stick with the 7 bladed non-clutch fan until 1967 when they introduced the 6 bladed clutch fans on AC equipped cars.  I have the 62, 63 & 64 Serviceman Bulletins, but not the 65 and later and don't know if they did in production experimentation as they had in 1964.