I have wondered about that little canister too. I think it is to give a chance for any liquid to flash off before it enters the compressor, just guessing. My Fords have them.
It is an interesting problem, kinda like siamese twins sharing crucial parts.
You can't measure the pressure at all points but you can measure temps and compare those.
Theoretically the refrigerant temperature drops after the orifice but if it is heated from proximity to the turbo you may not be able to measure it, try it.
|