Message: Okay a couple of quick questions, 1. what is the difference between a viscous and thermal type fans, 2. will it hurt to put a thermal on my truck (for the fact that the thermal are cheaper) and 3. how do i get the clutch off, i've tried cramming a screwdriver into it to hold it but it just keeps spinning.
Oh it's a '92 3.9.
Thanks for any input
Subject: Fan clutch