Recharging the refrigerant
Pro
Joined: Sep 2007
Posts: 735
Likes: 7
From: Bucks County Pa
AC Recharge
Hi, below is the link for plasticfan's excellant tutorial on recharging the AC. You will find everything you need to know about the subject there.
Good Luck
http://forums.corvetteforum.com/show...ghlight=ac+101
Good Luck
http://forums.corvetteforum.com/show...ghlight=ac+101
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 77
From: Forney Texas
Partly correct. If the engine is turned off and the refrigerant is allowed to equalize, it will be equal pressures on both ports. Only after you run the compressor will there be a pressure differential.
Burning Brakes
Joined: Oct 2004
Posts: 931
Likes: 31
From: Rowlett, Texas
Right on, Blownblue; R134 will stabilize in the system (or in the can) to about 100 psi, depending on the temperature around the system.
So, either the compressor was not pumping, or there is serious cloggage in the system.
Low and high side pressure with a running system at 1000 rpm will vary according to ambient temp and humidity. At 80 degrees and 40% humidity, pressures should be approx 26/200 PSI. Low side pressure will vary a pound or two as temps change, but Hi side can go up to 250 at 100 degrees ambient, and drop to 120 at 70 degrees ambient. Th8is is per my shop manual.
Hope this helps.
DG
So, either the compressor was not pumping, or there is serious cloggage in the system.
Low and high side pressure with a running system at 1000 rpm will vary according to ambient temp and humidity. At 80 degrees and 40% humidity, pressures should be approx 26/200 PSI. Low side pressure will vary a pound or two as temps change, but Hi side can go up to 250 at 100 degrees ambient, and drop to 120 at 70 degrees ambient. Th8is is per my shop manual.
Hope this helps.
DG
Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
If you dont know which port is which, you should probably just take it to someone who is at least semiprofessional with AC work.
Its a little more complicated than just adding refrig to a car.
The factors that all influence each other are:
Cabin temp, ambient temp, humidity, airflow across condenser, airflow across evap, evap discharge temp, volume of refrig and oil in system, engine rpms, high side reading, low side reading.
One of any will affect all the others, so its good to at least read up first before you somehow manage to force the can on the wrong port and blow it up in your hand.
Its a little more complicated than just adding refrig to a car.
The factors that all influence each other are:
Cabin temp, ambient temp, humidity, airflow across condenser, airflow across evap, evap discharge temp, volume of refrig and oil in system, engine rpms, high side reading, low side reading.
One of any will affect all the others, so its good to at least read up first before you somehow manage to force the can on the wrong port and blow it up in your hand.
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,840
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
The correct port ( low Pressure side ) is the one closest to the fire wall ( windshield ) right next to the battery case. The wrong one ( High pressure side )is the forward port closest to the radiator.
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