How much does it cost to replace the final stage fan resistor?

That depends on your market. If you type in to Repair Pal Estimator it will tell you. You'll want to type in "HEATER BLOWER MOTOR RESISTOR REPLACEMENT" in the search field and it should pop right up. I hope this helps, Stephane Grabina BMW Excluservice Rockville, MD 20852 www.bmwexcluservice.com