Thanks for the reply gents. I've heard it said that the 603 aux fan is inadequate but I thought it worked pretty well. Well enough that I was fine without the mechanical fan; but the weather here is moderate in terms of heat. Plus I rarely hit stop and go traffic. Anyway hope I can get it fixed, seems like there is just one electrical component to wear out. Looks like a big resistor but it's probably a capacitor or something else. I've seen similar fans at the yard, maybe interchangeable. Well that's enough of a sidetrack. Cheers!