Volvo Owners Club Forum - View Single Post - S60 Air Con:

Jim314 · Oct 13th, 2010, 17:55

The low pressure port will be in or will lead to a larger diameter line, and that line will be cool when the a/c is on (if there is sufficient freon in the system to provide some refrigerating effect). The low pressure side is the return line from the cold evaporator in the interior of the car to the suction side of the compressor. The high pressure line goes from the high side of the compressor to the condenser ahead of the radiator and from the condensor to the firewall and on to the evaporator inside the car.

It could be that the fittings on the two ports are different types and the charging bottle connector will only fit on the low pressure one.

How do you know it is low on freon? How will you know that you have added the right amount of freon? You can overcharge the a/c, in which case it will not cool properly. You might damage the compressor or expansion valve.

Oct 13th, 2010, 17:55	#2
Jim314 Premier Member Last Online: Nov 20th, 2018 01:45 Join Date: Feb 2009 Location: Dallas, Texas	The low pressure port will be in or will lead to a larger diameter line, and that line will be cool when the a/c is on (if there is sufficient freon in the system to provide some refrigerating effect). The low pressure side is the return line from the cold evaporator in the interior of the car to the suction side of the compressor. The high pressure line goes from the high side of the compressor to the condenser ahead of the radiator and from the condensor to the firewall and on to the evaporator inside the car. It could be that the fittings on the two ports are different types and the charging bottle connector will only fit on the low pressure one. How do you know it is low on freon? How will you know that you have added the right amount of freon? You can overcharge the a/c, in which case it will not cool properly. You might damage the compressor or expansion valve. Last edited by Jim314; Oct 13th, 2010 at 18:00.