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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
You can recharge your 2003 Kia air conditioning system through the low pressure port. Connect your Freon bottle to the low pressure port. Release the Freon into the system.