You can install R134a into any BMW manufactured in 1995 or later. Installing R134a recharges your BMW's air conditioner. All automobiles built after 1994 must use R134a for air conditioner refrigerant. Federal law also requires the port used to fill the R134a be a 13mm quick connect valve. This prevents you from connecting your R134a service hose to the highly pressured high-slide valve by mistake. This requirement makes it safe and easy for you to recharge your own air conditioner.
Step 1
Secure the low-side service hose onto your container of R134a. Keep the valve closed on the service hose.
Step 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.
Step 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.
Step 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.
Step 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.
Tip
You can purchase recharge kits at most auto part retail locations.