My 2001 silk 320 air conditioner is not blowing nor is the heater

Sounds like you need a blower motor or switch is bad but first check the blower motor fuse.

I just had the same problem with slk320. After a check by my local shop, they discovered a stopped up cabin filter and the blower was full of old leaves and typical stuff when parking under a tree. The put a new filter in and cleaned the contacts at the filter and problem solved.