What about the desiccant or some kind of combination filter I read somewhere?
The desiccant is available from any MB parts seller. It's replacement every 2 years is trivial - easier than changing an air filter.
This is the kind of stuff that has me worried. If the car is setup like a john deer tractor and I need software along with hardware repairs then I have a problem.
We will probably be dependent on the Mercedes dealer's proprietary "Star" syatem for some software resetting chores to some extent
Given the secrecy or nonavailability of this information, at this time I am knowingly accepting that at some point this car will be a throw away.
The biggest concern I have is that in a crash that triggers an air bag or seat belt tensioner, an internal pyrofuse cuts the connection to the contactor relays in the battery pack. Which, becasue the dealers are required to treat the battery pack as a "black box" with "no serviceable parts inside", effectively totals the car (replacement battery packs are over $20,000). In the case of rollovers or collisions with the car while it is parked and charging, the pack is only software-disabled and in those cases it can be reset. Note that this design is strictly MB thing. Other EV's do not have such ovrly-draconian safety measures.
Do these cars have electric driven AC compressors or do they run off the drive motor?
How is the brake master getting its vacuum boost? Separate vacuum pump or integrated?
Does it have power steering? Electric boosted hydraulic or drive by wire?
I am assuming for heat it has a toaster in the dash?
The AC compressor is electric - powered by the high voltage DC from the traction pack. Otherwise, it is the same as IC engine Smart's AC.
The heater uses a PTC ceramic heater element which is also powered by high voltage from the traction pack. Yes, use of the heater in winter has a major impact on the car's range.
All the other accessories are 12-volt and are identical to the IC engine Smart - including a 12 volt battery mounted under the footrest area of the passenger side seat. The battery is charged with DC-DC converter in the car's motor control unit.
Vacuum for the power brakes comes from a vacuum pump mounted in the engine compartment. You will hear it periodically turn on for a few seconds upon startup and after using the brakes several times - it is the noisiest thing in the car. There are no other vacuum-actuated components in the car.
The technical overview manual in Sokolff's the "sticky" post will probably answer other question you might have.