Quote:
Originally Posted by Squiggle Dog
How does one flush an evaporator?
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You can get a can of A/C flush from most auto parts stores. It is best to remove the carpet around where the connections are for the evaporator, so no oil/flush solvent will get on it. I usually put plastic and then cardboard down so if any splashes occur, it won't get all over the place. With the expansion valve off, squirt some solvent in one fitting of the evaporator, and then blow compressed air (as dry as possible) into it. Be sure to put a rag on the other fitting so the oil/solvent vapor does not spray all over. It also helps to put a piece of rubber hose over the fitting and into some kind of container to catch the oil/solvent. Do this till the fluid coming out runs clear. I usually reverse the process through the other fitting, so it is flushed both ways. Although it is best to use a dry gas for flushing, most people don't have it available. If you do, follow up with the dry gas at the end of the flushing process to get any moisture left behind by the shop air. The vacuuming process should take out any moisture left behind. Once the flushing is complete, you can hook up the new TXV using refrigerant oil on the Orings. You should flush the condenser as well if you can. Being a parallel flow, it will be harder to flush than a serpentine type condenser, but it should be done. With the hoses being new, evaporator and condenser flushed, you will be able to get the oil amount just right with no guess work. Be sure to check for leaks with pressure, not vacuum (this has been said many times here, and is the best way to find leaks). Be sure to remove the caps and connect the hoses to the drier THE VERY LAST THING.