On a 2003 Monte Carlo SS, the low pressure port for the air conditioning system is typically located on the larger diameter line, which is the suction line coming from the evaporator. You can usually find it near the firewall on the passenger side of the engine bay. It will have a plastic cap that is often blue or black, indicating it is the low pressure service port. Always ensure the engine is off and the system is properly depressurized before attempting any service.
To recharge the AC on a 2003 Monte Carlo, first, locate the low-pressure service port, which is typically found on the larger diameter aluminum line. Connect a refrigerant recharge kit to this port, ensuring the can is upright. Start the engine and turn the AC to the maximum setting. Open the valve on the refrigerant can and monitor the pressure gauge, adding refrigerant until the system reaches the recommended pressure level.
The low side pressure port for the 1999 Monte Carlo should be on a pipe against the firewall. It is just to the left of the Dipstick.
Freon is added in the low pressure port of the ac system. It is under the hood close to the ac drier.
There is a screw adjustment in the vacuum modulator port
Find the cross bar that goes from strut to strut. Behind that and against the firewall you will find a silver tube (resembles an updside down "U") with the charge (low side) port on it.
Where is the low side AC port on a 2001 Monte CarloIt is located near the firewall around the center line of the car. It is horizontal not vertical. The high side port is on the drivers side near the front of the vehicle. It is vertical.
Usually toward the front of engine - smaller hose gets hot when functioning
The low pressure port for the 2003 sable is on the passenger side of the engine compartment. It is right at the firewall made into a hose.
Under the air filter box. You'll have to remove the box to get at it.
under washer fluid contaner , look under contaners water &elect. connections
Should be located down by the battery its kind of tight spot is there a diagram or picture of the port?
Under the hood