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Looking on a open hood at your left(rigth side from drivers seat) follow your lines going towards fire wall, and just pass struth tower there it is, is hidding bettween fire wall and struth tower, your lines run at frame high just follow them back.
On the low pressure valve located between the compressor and accumulator. The low pressure port has a black or blue cap covering the recharge valve. Don't worry, you can't connect the hose to any other valve port but the low side, the hose end is different from the high side. The high side has a red cap, and is not a recharge port.
Oh, that's an easy one. The low pressure side is made up of larger diameter tubing than the high pressure side (aluminum tubing) that holds the refrigerant.
Also, the low pressure side always gets cold when working properly with the a/c on. The cold low pressure side piping will develop condensation on a hot day.
Sometimes the low pressure port is located on a post that sticks up and has a blue or black cap on it, similar to schrader valve but different.
The quick connector connects to the hose found in an r134a kit that may have a 12 oz. can of r134a for bumping up the amount of freon in your system (sometimes cars leak this gas slowly through o-rings).
YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.
LOOK FOR A BLACK CAP OR BLUE CAP LOW PRESSURE CHARGE PORT WILL BE ON SAME LINE NEXT TO DRIER OR ACCUMULATOR.OR TO EVAPORATOR LINE.DONT CHARGE PORT WITH RED CAP.THATS THE HIGH PRESSURE PORT AND DISCHARGE PORT.WEAR SAFETY GLASSES WHEN HANDLING REFRIGERANT.VERY DEADLY IF YOU INHALE. R -134 TRY NOT TO BREATHE AROUND IT WORK WHERE THERE IS GOOD FRESH AIR FLOW.
there are 2 ports one for low pressure and one for high pressure. the low pressure is bigger in diameter and is usually close to the dryer and or fender and firewall. the high pressure is near the condensor on the fron of the vehicle. if there are caps for the ports low will be blue and high will be red. low side pressure should be 35-50 psi and high pressure should be 135-150 psi