If it hasn't been coverted to R134 it will have to be
Buy a kit at Wal-Mart or auto parts comes with instructions
To recharge the Freon in a 1992 Mercedes 190E, first locate the low-pressure service port, which is typically on the larger diameter AC line. Connect a refrigerant gauge and recharge kit to this port, ensuring the system is off. Start the vehicle and turn on the AC to the maximum setting, then slowly add refrigerant until the desired pressure is reached, as indicated on the gauge. Always wear safety gear and check for leaks after recharging.
only authorized machine shops can do this due to enviromental concerns
Take it to an expert. You are not qualified nor do you have the equipment to do this.
You don't add Freon as it has R134a not Freon. You add it to the low pressure side which is the larger hose.
Take it to the a auot shop. you can not add freon
Contains no Freon. Freon was banned beginning in 1996.
where do I add freon to my air conditioning unit on a 1997 chevy truck?
Answering "Where do you add freon to your air conditioner in your ford ranger?"
You add freon to the low side fitting,top front,on the ac compressor
To add Freon to a 1992 Chevy Silverado 1500, first ensure the engine is off and the AC system is not running. Locate the low-pressure service port, typically found on the larger diameter aluminum line near the firewall. Attach the refrigerant can's hose to the port, then start the engine and turn the AC to maximum. Add the Freon slowly, checking the pressure gauge on the can, until it reaches the recommended level, then disconnect and securely replace the service port cap.
In order to buy freon you need a license, therefore you shouldn't attempt to add freon. Call a contractor to service your unit.
You call a licensed contractor and have them check your system. If they determine that it needs freon, they can add the right punt.