help overheating

[zadam123]

Another trick the ZU guys showed me, and this will determine if its the fan, pop the hovod, with the truck in park, rev the engine to about 2-3k rpms manually at the throttle body. If the fan isn't sucking a bunch of dirt out of the radiator, your fan isn't working, mine is like a hurricane under the hood when I do that and you can drop temp back to 170 in less than a minute.

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?

[Marlin]

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.