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The high pressure service port is located on the liquid line between the condenser and the evaporator, near the front of the engine compartment. The low pressure service port is located on the compressor manifold, directly over the suction port of the compressor. Make sure you know what your doing if you connect the wrong thing to the wrong port you can blow something up.
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.
mcdevito75 here, The low side port of your A/C is located on one of the shiny metal lines comeing out of the firewall, they are attached to the evaporator under the dash, from the firewall carefully follow these silver lines till you reach the charge port. The port may be covered with a brass looking cap, un srew the capp and the port looks like the valve on the tire.
The compressor is located underneath the drivers area towards the front. Right beneath the compressor is the low pressure port and there's where you put your freon. You have to raise the car.. follow your owners manual for jacking... you should also use a hard jack for support since you will go a little underneath the front of the car... use alight. I recommend you get the freon 134 kit that has a pressure gage so the you can see if the freon pressure ( pressure high full or a problem with system ) or low and needs charging
The factory doesn't provide a stand alone low side charging port, the only way I see to get to it is to take off the low pressure switch, and hook your gauges to the schrader valve. This will require an adapter, though.
On my diagrams it shows straight across from the high pressure port, and is the only opening to the low pressure line.
When you take it loose, jumper the terminals together in the wiring harness, so the compressor will still run and you can charge it.
On your car it is (low press switch) on the passenger side connected to the big AC line, in front of the firewall about 1/4 of the way from the firewall to the front of the car, under some hoses