Can you please tell me where this part is? Can't see it on any diagrams I have.

 

I am just beginning to look at changing to 134a, I got the new screw on ports, first issue, I cannot get the Schroeder valves out of the old ports, do I need to take them out? Also the smaller valve is the wrong thread size so have to look for a different one.

 

Still working on my ac, while I have it open I want to flushing it out. What can you use to blow through the system, I'm thinking brake cleaner. Any ideas. Thanks

 

The parts stores carry some flushing fluid in a spray can.
What ever you use it needs to evaporate well before you seal it back up.
So you have to be positive you got it all out.

I used liquid mineral spirits and the flush can to clean my contaminated lines from the black death debris that was in there after a dramatic compressor failure.
Ran fine for many years after that.
I liberally flush with an air hose, although many say not to.
I have a liquid drier on mine, so no moisture.

And I do go way overboard on vacuuming it down, once the new dessicant is in.
For me that is the key indicator.
I have a micron vacuum gauge, and I can watch water/moisture evaporate, and the vacuum climbs.
Only after it stays really low, for an hour, do I charge it.
A 29 psi vacuum just isn't the same, this micron one is like 1000X more sensitive, at those really low levels.
I only have a harbor freight single stage vacuum pump, and I can occasionally pull down to 300 microns, when the flexible gauge hoses don't leak, or aren't hooked up.
Other wise anything below 4000 microns is good to go, as long as it holds.
If it creeps up to 10,000 after a while, it's not good enough for me.
Water boils at room temp at 18,000 microns. If it will hold, below that, there is no moisture.
That is the same as 29.2 in Hg gauge pressure.
Not deep enough for me.
I want all that water/moisture out.

 

My car a while back would also hiss from behind the compressor and some freon would leak out. It managed to do it twice till we found out what was causing it. On my car we added dual electric fans to cool the engine, problem was that these fans would not kick on till engine hit a certain temperature. So the condenser would heat up and air would build pressure then freon would start hissing out of behind the compressor. Fixed the problem by setting the fans to run at 60% all the time car was on and at 100% when A/c kicked on. This fixed the problem.
Another possibility could be a faulty seal.