yboy82 10/14/2010The repair manual for your vehicle is hard to find. Did you already check the eBay or http://www.alldatadiy.com/about_alldata/index.html You can also use the Find a Shop feature of AutoMD to see a list of shops near you with their address, telephone # and labor rate per hour. You can call them and inquire how much for a replacement of a heater motor/blower.
Mikhelin 10/28/2010Heater Unit is very expensive, I would blame to Climate Control Unit to be replaced. . Your model 2001, I doubt the Heater Unit cause problem. Most common problem with Climate Control Unit. Most drift mechanics use his cross fingers to try to install both units one or other and charge you both. You must visit Benz Dealership to trust this equipment problems.
CARLOSSILVA 10/30/2010YOU NEED TO REPLACED THE BLOWER REGULATOR FIRST,THAT WILL RESOLVE THE PROBLEM,DONT REPLACE THE BLOWER MOTOR YET