Freon Charge

[Jepiza]

I wanted to know how if there was instructions on how to put freon in my 1999 e320? Any info will help. Thanks

[kplusten]

In the old days, owners could use the site window on the drier/condensor and add freon until the bubbles went away. If you want to add R-134A, you can do it yourself, just buy a can with an attachment and you'll see the low pressure line next to the left fenderwell (small plastic cover on it, long silver line). It won't attach to the bigger high pressure line which would be dangerous. BUT I DON'T RECOMMEND doing it yourself. The reason is you have no idea how much freon is in the system and it is very easy to overcharge the system, in which case it will keep shutting the compressor off due to overpressure. For about $50 plus the cost of R-134A you can have a service station test the system. They evacuate the system and add the correct amount of R-134A by weight, e.g., two pounds. Then they can check the low and high side pressures if troubleshooting is required and they check for leaks.