[mikesz]

Pedro has a good DIY. As mentioned above you can use the Durametric if you have one. I removed the 4 relays above the fuse block and made myself a "jumper" with a piece of wire and 2 spade connectors on each end. Put one spade in the top center slot and bottom center slot where the relay plugs into. Your fans should run if not you have a problem. 2 of the relays are for low speed 2 for high speed. When I checked mine the right fan wasn't working at al and the left only on low speed. testing them is easy replacing is much more fun.