Check the electrical connectors at the fan and relays for corrosion. Mine had some blueish powder growing in them. I cleaned them up with a bore brush and lubed them with dielectric grease. You may also want to check the AC/heater blower fan connector. Mine was so corroded that the the fan wouldn't run on high speed. This is what got me looking at all of the blade type connectors for corrosion. Just my experience.
Eric
