First, if the speedo doesn't register, most likely the cable is broken, so no odometer or speed control -- both driven off the cable in the speedo head. It's possible the speedo head went bad, but very unlikely, it's just a magnet and a disk and a bushing. The odometer may or may not work when you put a new cable in.
The AC blows out the center vents only part of the time, depending on temperature. You will need to check the vacuum servos to make sure, but if the outside temp is close to the setting on the dial, you will get no center vents. Use the temperature wheel to set desired temp. If you only get AC with the temp wheel all the way cold, you have a climate control problem, likely a bad interior temp sensor. If your odometer is not accurate, you cannot easily determine you milage unless you fill up, make a decent trip of known milage, then fill up again That's how I found out my "new" 87 300D was getting better than 30 mpg -- a trip to Ft. Wayne of 300 miles, filled up as I was leaving and again while I was there, used 9.6 gal of fuel. The odometer will slip (and won't work if the cable is messed up) before it goes completely dead. Check tires, brakes for drag (especially parking brake), wheel bearings, injection timing, transmission for slip (a milage killer for sure) and front end alignment. 21 mpg on the highway, something is wrong, should be at least 25. Peter _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
