[sholtby]

>Some garages get confused about the gas single input. They
>expect an input and output for re gassing - there is only an
>input on the 850.

Yeah, its next to the ecu box. The guy that serviced my aircon said it wasnt a problem but just took a bit longer to do.
The procedure was done by one machine. It evacuated all the gas in the system and weighed it. Then the system was pressurised with nitrogen to check for leaks and finally refilled with R134a gas.

Simon