PeachParts Mercedes-Benz Forum - View Single Post - Some A/C advice needed -- leaking valve stem

boneheaddoctor · #2 08-04-2011, 12:57 PM

You need a new schrader valve and yes...the system will HAVE to be evacuated before recharging because

#1 you need to get the air out....its non-condensing...and

#2 you NEED to get any moisture out.....

You really are supposed to replace the receiver dryer anytime the system is opened but that means you need new o-rings and need to replace that part of the oil.

However given the small size of the opening you can get the old one out and the new one in quickly enough you might get away with just evacuating and recharging.

Now there is a tool that will allow you to replace the shrader valve insert without losing the charge..if you know any HVAC guys...maybe for a few bucks you could get him to do it for you if they have one of those.

Legally, you have to have a recovery machine to suck the system dry before you do any work or you risk the enviro-nazis from coming over and doing unspeakable things to your nether regions. Because its illegal to vent refrigerant into the atmosphere.