How to Add R134 to a BMW

1. Secure the low-side service hose onto your container of R134a. Keep the valve closed on the service hose.
2. Locate the low-side quick disconnect valve on the accumulator hose. Again, the valve measures 13mm and connects to the silver hose extending from the accumulator. On most BMWs, the accumulator is on the passenger side and it is a silver tube with two hoses coming out of it. One side is the low-side hose and the second is the high-side hose. The valve is on the low-side hose.
3. Remove the cap from the hose and press the other end of the service hose onto the low-size valve. It is a quick disconnect valve so the hose will snap on just by pressing it onto the valve.
4. Turn on your BMW and turn on the air conditioner. Open the valve on the service hose and charge the air conditioner until the pressure gauge on the service hose reaches between 35psi and 40psi.
5. Turn off your BMW and disconnect the service hose from the low-side valve. Place the cap on the valve to complete the job.