My blower motor seems to move air pretty well, but thermal fuses only last a few days, which is an indication of a weak motor. On a side note, I bought my XJ in the winter, after it had set for about a year. We started it up and turned on the heat. The blower made an awful racket, then smoke started pouring out of the dash. Needless to say, we shut it down and investigated. It seems a rodent of some nature had stored a good quantity of dog food in the blower (note: roasting kibble does not smell very nice).