Thank you Acurazine fans!! Have a 2001 Tl and heat stopped working in 20 degree weather! Did just as posts suggested: Changed plug to blower, it was melted. Direct wired fan to battery, motor was good. Still no fan, so changed transistor and heat/ac working great!!!! Cabin filters were cruddy so changed them at the same time!! Thanks again!! DB from Maryland

 

I had this same problem on my 99 TL a couple years ago, it turned out to be the air/mix motor, this might be the same as the blower motor. Part number was
79160-S0K-A01