Thanks for posting that. Couple ??
-Does that controller only work on Diesel? (The Instruction manual states 7.3 Diesels only, but there may be one for the Gas models, Just call ford and ask if they have a "Aux Idle Controller for your model") It litterally takes 10 seconds to install, just plug it in and its all ready to go), it even has 12v supply to send the signal to your clutches relay.
-Your tensioner on the blower belts pushes down, did you change that? All 3 of mine lift. Yes I changed that, i just changed it to a flat belt idler from Tractor supply. This is the only way you can run smaller pulleys on the large blower to over-drive it without it slipping.
The belts also must be GATES GREEN POWER-RATED, they are MADE for back pressure applications. Those belts have been on this setup for over a year now, running that 56 at 110% its RPMs, at 16hg. They show ZERO signs of wear.
-What year is that van? 2000
Thanks Your Welcome