2009 Chevrolet Silverado 3500 HD A/C System Seal Kit

You should inspect the new O-ring seal, clean the sealing surfaces of the A/C refrigerant components, coat the new O-ring seal, and then assemble the A/C components.

You should remove the seal washer from the air conditioning (A/C) refrigerant component, inspect the seal washer for signs of damage to help determine the root cause of the failure, inspect the A/C refrigerant components for damage or burrs and then discard the sealing washer.

You should remove the O-ring seal from the A/C refrigerant component, inspect the O-ring seal for signs of damage, inspect the A/C refrigerant components, cap or tape the A/C refrigerant components and then discard the O-ring seal.

You should inspect the new seal washer for any signs of cracks, clean the sealing surfaces of the A/C refrigerant components and then assemble the remaining A/C refrigerant components.