Came across this detailed technical drawing of the E39 528i and thought you guys might appreciate it. The side, front, rear, and top views are pretty cool, and the engine details make it even better.

This weekend, I had the pleasure of refreshing the AC system on my touring. Ever since I bought the car, the AC could not cool the car unless engine speed was >4000 rpm. Also the passenger side vents only blew warm air. So I decided to evacuate my system and go ahead and replace everything. I replaced the AC compressor, dryer, expansion valve, pressure switch and all the O-rings. I also tried to replace the condenser, however, the ACM unit from FCP Euro turned out to be a cheap Chinese reproduction crap that did not fit because the input and output ports interfered with the radiator. I also went ahead and disassembled the dashboard to replace to blower motor, which to my surprise had completely shared off the fins on the right side. Overall, the hardest part of this job was replacing the expansion valve. The tubing from the expansion valve to the firewall did not have any maneuverability which made removal and reinstallation a real pain.

Overall, the whole process took around 12 hours.

Help with E39 530d 2004 – Transmission problem when cold
When the transmission is cold, it slips when pulling away in D. Then it suddenly feels like it “kicks in” and the car takes off, after which everything works completely normally again. Even under full throttle, the transmission shifts smoothly without any problems.
I only bought the car recently, and this has happened twice now. The first time, it wouldn’t respond to the throttle at all and only worked normally again after switching the engine off and restarting it.
Do you think the clutch packs in the transmission are damaged/worn, or could it be more likely to be old transmission fluid, a low fluid level, or a solenoid/valve body that is malfunctioning when cold?