I recently replaced my 603 fan clutch w/a 606 unit, and kept metal fan. I also changed serp belt out for new 1. All this was ~2k miles ago. All was fine, coolant temps were lower than 100C.

I noticed last week that coolant temp was beginning to pass 100C, and even hit about 110C briefly (its been real hot here). I shut down hot and could spin metal fan about 1 full turn or so, definitely NOT like it was went I 1st installed it – it would not spin more than a few fan blades. The brand is ACM and its from worldpac. Worldpac is kind enough to replace the part for 12 months if I tell them its bad. Maybe I should swap it out for 603.

So…as Im sitting there idling at lunch talking to wife, I start hearing a peculiar racket which gets worse and worse until the entire serp belt shreads itself under the hood. Luckily I have a spare in the trunk but Im wondering why this happened. I wonder if the fan clutch bolt has come loose (was I supposed to use locktite?).

I have a new tensioner, spring, and damper in there too. For some reason the belt rides about 1/16” off the front edge of the tensioner pulley, I cant figure out why either. I will have to dig into it tonight in the parking lot so I can leave work. Sucks balls.

__________________
Paul
Benz-less
I need an SDL !