All of the sudden I've got all these issues with my wife's '87 300D and I'm struggeling to keep up. Any help on the following would be appreciated:

1) I replaced the right rear inside door panel. It seemed pretty simple, but when I got done, the pneumatic lock system no longer worked and the seat belt alert light (center ceiling by the sun roof controls) started blinking even tho we're buckled in. These two problems started at precisely the same time: no problems before I replaced the door panel, but problems immediately after I replaced the panel. I took it apart and reassembled but but couldn't see how this could be been related other than the door lock arm that connects to the door handle. What could I have done replacing the door panel to cause this?

2) The heater/aircon fan has stopped pushing air. I noticed that a few of the buttons on the env control were acting a little flakey before so I suspect that the problem is just that the env control unit needs to be replaced. How can I troubleshoot this to confirm that the buttons are the source of the problem?

3) Last thing, someone got into the car and tried to break into the glove compartment... in the process damaged the dash, the glove compartment and the lower dash....so I've got to pull it and replace it. How big of a job is it to get this out and back in?...am I biting off too much?...I'm moderately intuitive with car maintenance but I only have a mainteanance manual for my '85 and don't have one for my '87.

Thanks for any advice on any of these three issues. -Harv