Originally Posted by toomany MBZ
The fan works, so it is not being "told" to come on at low speed. More than likely you have a cold solder condition in the climate control unit. that would entail removal and repair, a project, that although tedious, can be done. A rebuilt unit runs over $250, and you still have to remove and replace. Not to mention core cost. The monovale is a cheap and easy swap, just make sure you need a replacement. Remove the current one, and if the rubber part is still entact, it's fine. It is located on the firewall, remove two screws, right there it is. Do this with a cold engine, you'll save a trip to the burn unit. If you do not have hot heat, check the temp gauge to see if it pretty much stays around 80c when the heat is on. You may need a new thermostat, easy $20 fix. The slow sunroof is probaly due to - here's a high tech term - gunk. I have two MBZ that have the same affliction. I have purchased a kit to clean out the tube which houses the cable that powers the roof, that Hans built. Do-da, do-da. Anyway, this is a long, laborious, process. I am not looking forward to it, yet will attack albeit next season. To seperate the ball joint, you will need a fork available at your local auto parts store, usually, and upper body strength, not to mention a heavy hammer. I replaced an upper control arm, and tie rod, both of which came with ball joints attached, lucky for me. You will need to make sure you don't crush said joint when installing. Get back with me on that if neccessary. Check to see if you need front wheel bearing replacement, this can be a VERY expensive repair if a failure occurs at speed, I am putting my former mechanic's daughter through college as proof. The defrost is supposed to, I think, be high fan speed and full heat regardless of temp setting. The horn might be something as simple as a loose connection. Does it work at all? Sometimes? Weak? "Have fun in your garage"
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