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I am trying to recharge the AC in a friends 02 Pontiac Grand Am. I bought a can of R134A refrigerant, but am having a difficuly time finding the low pressure side of the AC to dd the refrigerant. I have found two caps on the lines, both are black, neither has an H or an L on them. The one cap I could easily get to in the front of the engine, by the radiator has a quick connect hook up on it, but iit does not fit the connection on the can of refrigerant. The other cap is smaller and has a threaded style connection to it. Any suggestions?
Re: I am trying to recharge the AC in a friends 02...
YOUR LOW CHARGE PORT LOCATION IS ON THE BACK LOWER FIREWALL LOOK FOR SMALL REFRIGERANT LINE WITH BLUE CAP GOING INTO EVAPORATOR IN THE FIRE WALL.THATS YOUR LOW CHARGE PORT.
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ok jeff yes there is a low side and it will be located by the ac resivoir up close to the firewall it will be a long cylinder with two hoses one of those hoses will have a fitting on it that will be the one a recharge cannister will fit on
It depends on the engine size,for the 4 cylinder,it is under the car on the low side ac line on the ac compressor,if it is a v6 engine it is most likely under the air cleaner box,near,or on the dryer.If this was at all helpful,please rate,thank you.
if it is the 3.4 v6 the low side is on the passager side behind the motor. it should have a blue cap on it, and the low side is the fatter of the two ac lines
yes you can! get an r134a hose and 2 or 3 cans of r134a refrigerant. Find the low side port which has a black or blue cap on it (unless it got thrown away) and use the 'quick connector' while the can is screwed on to the other side of the hose.
You can get a recharge kit for maybe $35 at walmart, which has 1 can of freon which might be all you need to get the cold back into your a/c system.
Make sure that the compressor turns and spins with the belt, and also that the fan turns on at the radiator when you put the a/c on high fan and the coolest setting.
The pressure should range anywhere from 25 to 45 psi when you do this procedure, and if the compressor is not turning the pressure should be 75 to 100 psi on a hot day.
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.
The low pressure valve is down by the AC Compressor. It is part of the aluminum manifold that connects directly to the AC compressor. It is accessible from above, but easier to reach from under the car.
By the way, is there any particular reason why you want to recharge your AC system? If it isn't working, adding refrigerant will not necessarily fix the problem. If the refrigerant has all leaked out, you probably need to evacuate the system first.
probably low on...no, not coolant! The AC system is separate from the coolant system. The AC needs to be recharged with
R134A, a special refrigerant used only for air conditioning, much like the old Freon or R12 it replaced. R12 was bad for ozone depletion, so about 20 years ago the federal government mandated a change to R134A.
Just go to a shop and tell the service people you may need the AC system recharged.
You take your car to the nearest licensed automotive A/C shop and have them evacuate the system and recharge.
I'm saying this because once you have opened the system, you have let moisture into it. Even a small amount of moisture will damage your A/C system, and needs to be removed. Also, they will know just how much refrigerant to put into the system once it is moisture free.
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