Hi Scotty - I installed a new a/c compressor (pre-filled with correct amount of pag oil - Nissens) along with new condenser and expansion valve. Also flushed evaporator and lines and added new or-rings. First question - do I need to be concerned about slugging compressor due to all of the pag oil sitting in the compressor when it turns on for the first time? 2nd question - does it make a difference how I introduce refrigerant into system prior to starting car based on new compressor? Some people start car first, click on a/c then introduce refrigerant until a\c kicks on. Others add a can to high and low side engine off or add until pressure equalizes then start car and continue adding to low side. Last question - I plan to introduce all refrigerant gas side whether engine off or on - can you comment on gas vs liquid?
Many Thanks.
Hope this finds you and your family well.
r/Michael
Never turn the can upside down so it goes in as a liquid. This can damage some AC systems.
You should have also replaced the dryer/accumulator, it helps remove water vapor from the system. But if you run the vacuum pump long enough you should be ok. Your gonna want to get a set of gauges and vacuum pump, most Auto places loan them, along with freon scales. Hookup the gauges and pump, then the valves open for low and high sides run the vacuum pump for about 45-60 mins. You should be at -30 on both gauges. Close both sides with the valves underneath the gauges. You won’t be opening the high side anymore at the point. Let the car sit for an hour make sure the vacuum holds. If it doesn’t you have a leak. Remove the pump and hookup your freon can to the yellow line. On the yellow line by the gauges is a schrader valve so you can release air from the yellow line. Set your scale to zero and open the cold side only valve. Start the car and turn to max ac. The scale will reverse tell you how much freon has left the can. If your using small cans your gonna need 2-3 depending on your car. Somewhere in engine bay is a tag tells you by weight how much freon to put in. As the first can empties the pressure should come up enough for the compressor to engage. Eventually you will have to close the cold valve. Swap cans, repurge the yellow line and zero your scales for next can, keeping track of amount removed and adding your values together.
Thank you for the good advice. I should mention that the new condenser comes with dryer already installed, Nissens.
Cool, I always have to look most parts up. Have to much goin on in my head remember what comes with what. 🤣🤣🤣🤣