The rear line Y's near the fuel flap lock. A leak in either side of the Y will (of course) tend to kill operation of the other side too.
Don't forget that the lock switch in the driver's door can go bad, too -- we had to replace the one on my brother's 75 300D. They can also get out of adjustment, making them leak.
I believe I have actually had (in my fleet) more bad door lock valves than bad door lock actuating diaphragms. (While the 'motors' are certainly moving parts, they are fairly heavy rubber and only move. The seals inside the valve are very lightweight, and are _sliding_ parts.) You test this by corking off the output lines coming out of the valve, then pumping it down with the MityVac to see how long that (small) volume will hold vacuum. In both locked and unlocked positions. With no output motors, and no vacuum reservoir, you're testing just the valve and some piping. The basic rule is: divide and conquer. That means not just split open the system, but isolate them and test them separately. Or, in other words, if you don't need at least one golf tee to do the testing then you're not doing it right. -- Jim _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
