This is the repair manual you 124 owners have been waiting for. Includes wiper motor removal instructions! If your blower motor has been intermittent or some days it will not come on until you drive for a while, your motor brushes are most likely at the end of their life.
Try this simple test. The next time your heater motor will not come on try slamming the door. See if it comes on and you will know what you have to do to fix it. 15 or more year heater motor brushes are very prone failing at any time. If it has not failed yet it most likely will sometime soon. You will need a soldering iron and a few common hand tools to complete the job. If your car has a over 150,000 miles on it or you know the heater motor has been run a lot, the best time to do this job is now! Do not wait for it to quit on you on a cold winter morning.
HEATER MOTOR BRUSHES NOT INCLUDED. We do offer a kit that includes the manual and the brushes and we offer the manual as an electronic PDF for purchase with immediate delivery to your Mercedessource.com account, both listed below.
IMPORTANT: If you are planning to replace your heater motor brushes I highly recommend you have a high output soldering pencil on hand. If you don't, then I recommend you purchase the one we sell on our website. It is a powerful 60 watt unit and works great!