You can read about the 2 most common Heat pump systems in measuring method (self study) bulletin No. 8100 and 8370.
Go to www.ddtsb.com

We are curious to know on which of the cars you need to use a diagnostic tool to fill the A/C refrigerant (open the valves).
So please share if you know of other models than Volkswagen group, BMW and Tesla.
Also please share if you have experience with the consequences if you fill the system without opening the valves using a diagnostic tool. This could be an extended time on fast charging.
We would also like to know your experiences with models (using Heat pump) where you don’t need a diagnostic tool to fill the refrigerant. Such as PSA, Renault and Hyundai/Kia.
A database with this would come in handy in our program.
May we remind you that Elektro Partner operate with limited staffing in week 28 and 30. We will be completely closed in week 29.