Model: Town & Country
Engine Size: 3.8L
Refrigerant Type: 134-A
General Question. I have read that any system over a period of years can lose refrigerant. I have also read that it is a very bad idea to try to top off an A/c system just relying on pressure readings. Therefore it would seem that the correct way to get the right amount of refrigerant in is to vacuum down the system and add the car manufacturer's specified wt. Gauge indicates system is somewhat low on refrigerant. If i were to vacuum and capture the old refrigerant and then add the appropriate amt of freon using an electronic scale and 30lb tank, do I need to add any oil to the system if no components have been replaced. If so, how much and what is best method of doing it? Thanks for any advice.
If your system has had no issues, and just appears to be a "little low", I'd add 0 to 2 ounces of oil. First: how did you determine that it was a little low? High and low pressures at about 1500 rpm, and what are your vent temperatures. In other words, don't blindly add refrigerant.
Thanks for the reply. Have been side tracked and will hopefully soon be back on a/c project. Will indeed be closely checking pressures as you suggested. One additional question. The van has front and rear A/C. Presumably with separate evaporators. Anything different I should know when vacuuming the system? I assume rear air should be on and in max position when charging system? Comments appreciated. thanks
Edited: Thu September 03, 2015 at 11:14 AM by Notsobright
If you have no leaks you should not have lost any oil. As mentioned you can add a small amount depending on how much refrigerant is reclaimed. But even then, unless you have a noticeable leak. It will simply be a guess as to how much is needed.
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