I will replace the two high pressure switch's on the evaporater this weekend (Thanks Phil). Is there an easy way to bleed the system prior to removal? I was told to use a small amount of Teflon tape to aid sealing, is this a good idea?

Will someone please respond? I have searched this site and I would like to know if it is possible to bleed the A/C and replace the two high pressure switch's on the evaporator. Is it possible to bleed the system by slowly removing a switch? The system blows at ambient temp, and the leak is at the switch (confirmed by A/C shop that does not work on MB's)

There are no high pressure switches on the evap core. The only pressure switches on the system are located on the drier bottle located behind the driver's headlight. You can't drain the system without a recovery machine. If you pull the switches, you will loose all of the freon.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS

Thanks Benzmac, it is the dryer bottle as you described (still waiting for my cd's) where I need to replace the switch's. I realize I will lose the freon, but is it safe to R/R the switch's? - should I use teflon tape? - would it be wise to have the system flushed and filled or just filled?

From a diyer - you will lose whatever freon is in there AND it will make a big mess. It can be done - when you remove the switch just make sure you have some goggles/safety glasses on, slowly unscrew the switch and do not stand in the direct "line of fire" while removing it. In addition, the longer you leave the system open the more time that moisture has to get into the system.
I would suggest finding a good independent a/c technician, taking the vehicle to him/her with the new switch and having them do the job.

I usually take it to my a/c technician, ask them to remove the freon, do whatever work is necessary and and then take it back to them to run a vacuum and recharge the system. Figure at least an hour for them to run the vacuum.

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Jim