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You can add freon on the low side service port that is located on the accumulator next to the firewall................
the port to add freon is under the car in front of engine coming off the compressor hard to get to but can be done
The low pressure port is the same place that you add Freon to your air conditioning system. The low pressure port will have a blue top.
add r134a to the service port
It contains no Freon. It contains R134a refrigerant and you add it to the low pressure port which is the larger pipe.
You can add Freon to your 1999 Chevy cooling system through the low pressure port. Connect your Freon bottle to the low pressure port and release the Freon into the system.
Freon is added through the ac low pressure port. The port is located on the aluminum pipe on the ac line.
You add the refrigerant through the low side service port.
The 2000 Chevrolet Silverado truck has two ports on top of the air conditioner compressor. You will add Freon through the low pressure port.
Freon is added into the low side ac port. Using the proper type Freon, and a gauge that works with that type Freon, connect the hose to the port. With the engine running allow the Freon to flow until the gauge reads in the ok range.
you add it to the LOW pressure line running from the front of the car to right below the bottom of the windshield. There should be a blue cap on the inlet port with an "L" in the top,.
The low side port, which is the smaller one.