W124 A/C flush
 

Guys,

I'm contemplating trying to revive my A/C system (1995 E320), and just wanted to hear from someone who has BTDT.

What's the most efficient way to get the entire system flushed, so I can start out with the correct amount of oil and refrigerant? I know I can't flush through the compressor or expansion valve, for example, but are there any other hoses I can't flush through? Should I plan to break apart every single connection, or can I reasonably expect to get the job done by flushing through multiple connections at a time (a hose and the condenser, for example).

Thanks in advance.

Gary
1995 E320

Also should not flush thru the drier. You will need a new drier once you are ready to put the system back. I am assuming you will also remove the compressor and expansion valve and clean them seperately without passing compressed air.

You should be able to flush from the point past the expansion valve all the way to the inlet point at the compressor (this will clean the evaporator). Also from the exit point from the drier to the entry point of the expansion valve (this will clean the condensor). The expansion valve, either you can clean it or replace it with a new one.

Hope this helps.

If you remove your compressor, it is very easy to flush it out. You can also check the connections on your speed sensor (if so equipped) or just change it since they can be a pain after many miles. .

When flushing, just turn it by hand, adding flush liquid to the suction side. Before remounting, be sure to add oil, and turn the compressor many times while tilting it up and down so that oil covers every thing inside, so that you don't have a dry start. Top off with recommended amount of oil through suction side after mounting so you don't spill it.

Don't use flush liquid on your compressor. Flush it with compressor oil only.

Why?

Also if you are switching from R12 ro R134a, you may have to flush the compressor with some flushing agent other than oil, minerel spirit is what I have used on my compressor.

Brake cleaner also works great for flushing hard components, such as the compressor, but keep it away from the soft parts as it can deteriorate them.

Thanks for the suggestions guys. I was planning to remove the compressor (got to replace the shaft seal while it's out) and replace the dryer.

This one was 134 from the factory, so conversion is not the issue.

Gary

If you are simply replacing the oil with the correct amount, just dump whatever is in the compressor and let it drain a bit, and fill into the suction side with the correct amount (which I do not remember at the moment). Use PAG oil.

It is not necessary to flush the rest of the oil out unless you need to remove debris.

Peter