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if you have a 3.1v6 it is between the firewall and the valve cover on the back side of the engine.
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.
Connect a freon gauge and the freon can to the low side ac port. With the ac running on high and the engine running, open the freon. Let it flow until the gauge shows that the system is full.
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
Connect a freon tank an gauge to the Astros low side ac port. Start the engine and open the ac to high. Open the freon tank and fill the system till the gauge shows full.
Connect the pressure gauge to the high pressure port. Discharge your Freon into the low pressure port. Stop the Freon discharge when the Freon engage reaches the appropriate level.
The low pressure Freon port on a 2005 Subaru Outback is located on the center of the engine compartment, in front of the engine block. It has a yellow cap.
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.
To add Freon locate the low-pressure port on the A/C system, also called the low-side service port. You will find this port against the firewall, at the back of the engine compartment.
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 in the low pressure port of the ac system. It is under the hood close to the ac drier.
Find the low pressure ac port in the blazer. Connect the freon and a gauge to the port. Start the engine and run the ac on high. Fill the system till the gauge shows full.