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Depends on the year. Cars in the early 90's used R12. Anything later uses R134a. The size of the charge ports will define the R134a port. An adapter is needed to fit on the charging hose. R12 requires no such adapter. Ther charging label under the hood will tell you what refrigerant is needed too. Since you failed to give enough information on what make and model car you have, a general answer for the location of the low pressure port will be given. On the compressor, the larger diameter hose connection is the low side. Connect there, or look for the drier/accumulator (Large diameter silver container near the firewall). Connect there. You will need to access the AC information label under the hood to determine how much freon to add to the system.
locate the A/C lines along the passenger side that go from the condenser to the firewall. the low side port is smaller than the high side port. you have to look at the ports to see the difference is size and they each should have a cap screwed on them to keep dirt out of port.
Hello,
The low pressure port for charging the A/C system is located on the larger aluminum tube coming from the A/C compressor. It is usually located in the tube line near the accumulator. That is an alumninum cylinder about the size of a soda can or slightly larger usually located close to the firewall along the left fender side well. It will have a plastic screw on cap on it, usually stamped with an "L" on top. Your recharge hose will only connect to the low pressure side, the high pressure port is a different size valve for safety reasons. You can only get an accurate pressure reading with the engine running and A/C running at max cold. blower on high speed, after about 5 minutes of A/C operation. Temperature outside will also have an effect on the pressure reading, optimum ambient air temperature of 70-80 degrees farenheit. Directions for recharge are on your R134a refill kit, but the system does require 20-30 PSI for the compressor to kick on. If your compressor is engaging while you are refilling, you can probably do it successfully. If your pressure is extremely low and compressor does not kick on, you most likely have a leak in the system which will have to be found and fixed before you can charge the system......Mike
The 1998 Dodge Caravan ac should be charged at the low pressure service port. This port is located on the suction line near the compressor. The suction line can be identified by it's size, it being the larger of the two line connected to the compressor. You must purchase a recharge kit at your local part store, which should include charging hose with pressure gauge and a can of R134a freon. Gloves and eye protection should be worn during servicing.(freon can freeze your eyes and cause frost bite to your hands). Connect freon to charging hose, connect charging hose to low pressure service port, open valves and start engine, turn on ac. If compressor won't start it may be required to disconnect the low pressure switch and jump out the connector.
hmm ..if you are looking for the low side air conditioner port .. then locate the condenser (thats in front of and looks like the radiator) .. you will notice two tubes going to that ..one is large the other small .. the small tube is the high pressure side .. the large tube is the low pressure side ... follow the large tube back until you find a cap that covers the low pressure port .. thats where you would fill with new refregerant (r134a) .. if you buy r134a, you can also get a filler hose and gage.. that hose will only hook up to the low pressure port ..it wont fit the high pressure port ...
Hi .. I just ran into the same problem .. I have a 2000 Expedition with the 5.4L engine .. the low side port is located on the passenger side of engine compartment just below the black metal bracket that contains electrical connections right in front of the firewall... you have to reach under this and locate the low side (larger line) and feel for the connection .. it is right in front of the accumulator .. There are two heater hose that hide the port .. you have reach under these to unscrew the port cap which is black .. you'll have to do this by feel .. I have found that you can by R134A charge with dye and leak sealant helps with small leaks .. if the system takes more than two cans be usre to add refrig. oil .. hope this helps
The low pressure port on the 2003 grand am is actually behind the engine, near the firewall on the passenger side. Good luck getting your hose down there though, I ended up buying an extension hose.
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