A/C condenser O-ring seals prevent refrigerant from escaping at the hose connections. These seals are made of green HNBR rubber, which resists oil and refrigerant. Standard black plumbing O-rings will disintegrate in an A/C system. O-rings flatten and crack over time due to heat cycles, causing slow leaks.
Mechanic Glossary
A/C Condenser O-Ring Seal
The rubber seals placed at the inlet and outlet pipe connections of the A/C condenser to prevent refrigerant leaks.
Frequently Asked Questions
The green color indicates they are made of HNBR rubber, which is compatible with R134a/R1234yf refrigerant and PAG oil.
No. O-rings take a set when compressed. Reusing them almost always leads to a slow refrigerant leak.
Yes. Coat them with clean PAG oil or mineral oil to prevent them from tearing or twisting when you tighten the fittings.