Well when I got home tonight the fan was waiting on the porch for me, so I threw it on and took it for a spin.
On Sunday I decided to put the fan shroud on, even though it still had the stock fan. That lowered my cruising temps about 5* or so, and full throttle uphill temps a little more than that. I’ll be interested to see what the difference is with the new fan.
I have a good fan clutch, seems like it engages a bit earlier than they are supposed to but has been very consistent in where it engages, and too early is better than too late to me, so I feel pretty well off in that department. I don’t know if it’s a Motorcraft fan clutch though… it looks different than all my other IDI fan clutches… but it does still have a Ford part number.
My 91 came with the ‘Super Cooling’ package, and is Canadian market so who knows what could be different. In any case, the fan bolted right up to the clutch.
I am wondering about maybe getting the electroviscous fan clutch kit that
@03wr250f sells, one more thing that I could control, the fan clutch
Tomorrow it’s supposed to be 100 degrees here, so that will be the real test.
It was 80 degrees when I drove it a few minutes ago with the fan, so I didn’t notice a huge difference, but I got the clutch to engage after some 3000+ RPM driving, (easy in a truck with 5.13 diff gearing) and it definitely sounds different. It changed my idle sound a little, even when the clutch is unlocked.
It did its job, but tomorrow will be the real test.
I did notice a difference in AC vent temps, went from 44* to 39*
both tested at same 80* ambient, just different fans.
But keep in mind, the old truck runs pretty high RPM going down the highway, so AC compressor is getting spun pretty fast… engine sits at 2550 RPM at 60 mph, and I typically drive faster than that… so everything sees plenty of spinning…
That new fan sticks back a little further, lot closer to the belts… not as easy to get on and off as the stock fan, but still doable, just less space.