1997 e320 P0715 check engine limp mode
1. Buy MB/Mopar "tranny adapter plug" $12/$14- genuine MB only - not China/retail-no-name - do a search for replacement procedure
2. Buy a can of MAF cleaner ($9) - do a forum search for pulling/claning TCM - tranny control moduie
3. Research and consider correct/proper basic transmission service - do forum search
Your tranny is the soft spot you need to address 1st - since correct diagnosis/repair/service is the 1st step to get you out to 267K miles.
Aircon can be deatl with separately - 1st things 1st






