Quote Originally Posted by zadam123 View Post
Should i try this on a cold Modor or let it warm up a little bit also how do i know if it's sucking dirt from rad. Do I just open the cap and look for bubbles is that what you mean?
For the sake of others, doesn't matter if truck is hot or not, you can actually feel the air from the fan blowing across the engine, it is really like a hurricane in there, at least with the torque cool fan clutch. Nothing to do with the radiator or anything. If you have any dirt or whatnot in the radiator externals, the fan will suck it through.