I have read many posts in the past year that claim the reason for the resistor block burn up was a defective blower. I have just had my resistors replaced at the suggestion of my mechanic, with this info. The blower works now, but will be on the lookout for it to quit again. I have 2 years warranty on the repair, which is the only reason I let him change them.
The thought of an other mans hands on my truck.. eeeew.