Hello All,

I am experiencing the following problems with my '84 300DT and I'd like to know what you think:

1. I figured I was having a vacuum problem when I noticed the car shifting rather hard. After making sure that the automatic transmission fluid was at the proper level (by changing it) and ensuring that all the vacuum lines were tight, and replacing both 3-way vacuum valves (which were brittle to the point of dissolving) and other miscellaneous vacuum hoses and fittings, etc. the shifting did get better, but it's not completely fixed and still "clunks" as it shifts. Somedays it works perfectly but I've forgotten the last time "Someday" was. It also tends to shift from 1st to 2nd after revving up to 4500 RPM which doesn't feel right to me.

I'm thinking that the one piece I haven't replaced yet may be the culprit: the Vacuum Valve itself. What do you think?

2. I just noticed the second problem now that the weather has cooled down a bit ... the heater which normally will burn you out of the car is quite cool when the car is moving (i.e., 40+ MPH). As the car slows down (and stops), the heater warms up to expected levels. I experience almost the same thing with the A/C ... it's cool but not cold at cruising, but chills down appropriately when the car has stopped.

I'm thinking that the problem here may be the Mono valve. These are, of course, not inexpensive items, though, I did notice that ************************ does have what they call a Mono Valve Repair Kit (the plunger chamber and seal) for a mere $29.

3. And finally, as an aside, is there any quick idea as to how the drivers side window regulator can be removed? I'm guessing that the window must be in the down position before the regulator and motor can be removed?

Any suggestions would be greatly appreciated,

Thank you!

__________________
Peter Lehmann
'84 300DT 279K
'99 E300 92K