Recharging AC- where are the high and low lines?
Registered User
Joined: Mar 2000
Posts: 2,037
From: 51°N 114°W, 3500' elevation
High side is the pressure side. It starts at the compressor port marked P (pressure), goes through the condensor in front of the rad then to the accumulator (big shiny cylinder) then into the firewall. The low side is the hose that comes from the firewall back to the compressor port marked S (suction)
Or do I have that the other way around?
Or do I have that the other way around?
Registered User
Joined: Mar 2000
Posts: 2,037
From: 51°N 114°W, 3500' elevation
I mad a mistake. I went and looked at my system. The accumulator is on the low side.
From the firewall to the accumulator to the S port on the compressor is all low side. The high side comes from the P port on the compressor, through the condensor in front of the rad then to the firewall. The access port at the compressor is on the high side. The port on or near the accumulator is the low side.
Unless your system is completely empty, there will always be a little bit of pressure in the system even on the low side.
There should be a label somewhere saving how much freon is in the system. My truck was 2.2 pounds of R12. I only put in 2 pounds of R134A since you have to put in something like 80% of the R12 charge.
From the firewall to the accumulator to the S port on the compressor is all low side. The high side comes from the P port on the compressor, through the condensor in front of the rad then to the firewall. The access port at the compressor is on the high side. The port on or near the accumulator is the low side.
Unless your system is completely empty, there will always be a little bit of pressure in the system even on the low side.
There should be a label somewhere saving how much freon is in the system. My truck was 2.2 pounds of R12. I only put in 2 pounds of R134A since you have to put in something like 80% of the R12 charge.
Thread Starter
Registered User
Joined: Mar 2003
Posts: 969
From: Massachusetts
Yeah, it said 2.25 lbs. Thanks alot. Its all charged and is blowing ice cold. THe thing that is odd is that the cans didn't empty all the way so i took them off and had that stuff shooting everywhere!
Thread Starter
Registered User
Joined: Mar 2003
Posts: 969
From: Massachusetts
Originally posted by Kwiksilverz28
You opened the cans and they equalized pressure with the system, then you closed the cans and removed them. They had the exact same pressure as the system after you removed it. :-)
You opened the cans and they equalized pressure with the system, then you closed the cans and removed them. They had the exact same pressure as the system after you removed it. :-)
It took me about 20 minutes and the whole time was just waiting for it to equalize, so I reccomend doing it yourself. I tried it today, it was nice!
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