To replace an air conditioning hose on a motor vehicle, locate the compressor, and examine the two hoses extending from it to isolate the leak. Connect air conditioning gauges to the leaking hose, and use a refrigerant recycling machine to remove the refrigerant. Use a socket wrench to remove the bolts holding the hose, lubricate the new O-rings with air conditioner lubricant, and connect the new hose. Use a vacuum pump to remove moisture from the hoses, and add refrigerant.
Wear safety gear, such as goggles, when removing and recharging the refrigerant, and disconnect the battery while repairing the hose. Reconnect the battery before attaching the vacuum pump to the hose.
To connect the vacuum pump, connect the low-side gauge to the low-side hose, and connect the high-side gauge to the high-side hose. Connect the hose in the center of the manifold to the vacuum pump, and turn the pump on. Allow the pump to run for an hour, and disconnect the vacuum pump.
To add refrigerant, connect a can of refrigerant to the middle hose in the gauge manifold. Refer to the owner's manual or the sticker located under the vehicle's hood to determine how much refrigerant to add, and test the air conditioning after adding the recommended amount of refrigerant.