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This post just made me chuckle...made me think of something I made jokes about quite often years ago, back when just about every car you worked on had a mechanical fan. I'm convinced (not really, just part of the rant) that a young guy started in 1950 with GM in the "Cooling Division" & after a few days on the job...looking at this basic cross 4 blade fan he thought: "How am I ever going to make it to retirement here?" To keep his job, he set out to make "new" fans...curved blades, folded blades. Later 3 blades (in the early Astro vans) MANY 5 & 6 blades, even some of those big Buicks & Caddy's in the '70's had 7 & maybe even 8! more curved blades, big spaces, no spaces (7 blades!) 14", 14 1/2" 16" 18"...this clutch, that clutch & so on. He retired around 1990 & they said: "Now what are we going to do? Fred the fan man is Gone! Some electrical wiz kid stood up & said: I'll take that department over" ...the rest is history! Seriously, I'd love to spend a bunch of time with a pile of fans on a dyno & air flow readings (which is what GM did) to see what amount of difference some of them made...I bet MANY of them are so close it really wasn't worth the bother, however they needed .2 MPG or something to get where they needed to be. Lorne
That looks exactly like the fan on my '75 350 K10 (minus the crusty stuff).Off Topic:Times were good for Harold the high beam switch guy too.Harold was responsible for the same floor mounted high beam switch for decades making only minor changes during his long and illustrious career.Then came Steve the steering column guy who one day proclaimed “I can move Harold's high beam switch from the grungy floor to my new super awesome turn signal stalk”.Sadly, Harold retired a broken man however Steve continues to pack more stuff into his turn signal stalk than Harold could have ever imagined. Just ask Wilbur the wiper switch guy, Christopher the cruise control guy, and Horatio the headlamp switch guy.
Well that is the thing. I don't know if the original fixed fan is what should be on the truck. And the fan I got is similar to the one I posted. I know the fan blades are opposite to one another and I had to take off the fixed fan because it was over cooling my truck. I've tried to find pics of trucks of the 73-80 era with clutch fans but they don't seem to exist and I can't find any around where I am.Also I've learned that any truck that uses serpentine is reverse rotation and the same thing applies to the clutch.Said fixed fan.
Yes over cooling. With that fixed fan on my truck I could not get the thermostat to open AT ALL. I had to pull the fan off to get it to tempreature high enough to open the thermostat. I am using a stock 195 and with the fixed fan the highest the thermostat would get is around 180. This was all verified with a infrared thermometer gun.