Where is the low side port for the ac system located want to recharge system with kit

High and low side will be different sizes

it is the one with the black plastic cap nearest the fire wall passenger side next to the dryer just clip on a/c charger kit go to about 45 lbs r134a the 2 ports are different sizzes anyway

NOT HARD TO ADD BUT YOU NEED A MANIFOLD GAUGE SET TO CHECK AC REGERANT LOW SIDE SHOULD BE 32 - 65 HIGH SIDE SHOULD BE 150 - 325 PSI. DONT PUT ANY REFRIGERANT IN AC SYSTEM IF SYSTEM NOT LOW.PROBLEM COULD BE ELSE WHERE COULD HAVE MOISTURE IN THE AC SYSTEM. CONDENSOR COULD BE OVERHEATING COOLING FAN NOT RUNNING OR AC AIR DOOR NOT OPENING.IF AC REFRIGERANT LOW THE LOW CHARGE PORT NEXT TO REAR STRUT TOWER ON PASSENGER SIDE LOOK FOR SMALL REFRIGERANT LINE WITH CAP GOING TO ACCUMULATOR THE THE INTO FIREWALL TO EVAPORATOR THATS YOUR LOW SIDE.GO TO AUTO PARTS STORE BUY AC R-134 RECHARGE KIT AND WHERE SAFETY GLASSES PROTECT EYES.

the hose fitting that you attach to the low side port will only fit that port-it cannot fit the high side (that port is too big) so you cannot do this wrong. The low (suction) side is between the compressor and the evaporator (passenger compartment, usually in the heater core plenium.)

You found the high side port. The other line should have the low side and if it is not on there it might be at the AC evaporator which is a cylinder shape made of aluminum. The cap will have a L on it not a H. Do not force it on the high side.

The a/c recharge kit will only fit on the low side. So you can't get a can to fit on the high side.

Hi, determine if your car uses R134 or R12 refrigerant. You will notice screw type connectors on the both the High Pressure Side and Low Pressure Side lines in models using R12 refrigerant. R134 compatible models have quick connect valves on both sides. Models made before 1995 may use the old R12 refrigerant. If this is the case, you must have your Chrysler's air conditioning system retrofitted to use R134 refrigerant. Mixing R12 and R134 refrigerants is dangerous and may cause damage to your vehicle. Check your air conditioning system pressure using an automotive air conditioning pressure gauge. Keep in mind that in order to get an accurate reading, the air conditioner has be turned on the coldest setting with maximum blowing power. Remove the Low Pressure Side port valve cap and set it aside. The location of the port varies, but it is usually in front of the engine block. Attach the refill hose to the port on the Low Pressure Side of the air conditioning system. The Low Pressure Side port is smaller the High Pressure Side port. Because the ports are different sizes, the refill kit hose should fit only on the Low Pressure Side port. Additionally, the High Pressure Side port will usually have a red cap or be marked with an H or the word High Allow the air conditioner to **** the refrigerant out of the can by slowly turning the valve on the refill kit hose. Pay attention to the way you hold the can. Most kits will have you hold the can upright when you recharge the air conditioning system. It may take as long as 10 minutes to empty a single can. Turn the valve to the off position and remove the refill hose from the port. Recap the port before closing the hood. Let the air conditioner stay on for at least 30 minutes. This allows the refrigerant to move throughout the entire system.
Take care

The kit will have full instructions included. The important thing is to tap into the LOW side of the A/C ...NOT the high side. The low side port is located between the compressor and the accumulator. The low side port also has a blue/light blue cap over the valve. The high side has a red cap.

Newer vehicle come with R134 vs R12. Since the two are not compatible, R134 has larger fittings. AC system has two ports, High and Low. Low is return to AC Compressor and high is output. High port is first following line from compressor to condenser (condenser is at front of vehicle like a second radiator). Keep following line till you find high port (paint cap red). Second port is low (paint cap blue).

You can only attach the the recharge hose from the kit to the low side ( A/C service port) and the cap should be blue with a leter L on it. Good luck and follow the instruction and don't over charge the system. With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood.  Good luck and hope this helps.