Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Refrigerant Circuit O-Rings
- Always use O-rings only once, replace.
- Coat O-ring seals with refrigerant oil before inserting.
- Make sure O-rings are seated properly on pipe or in groove.
- Perform the work under clean conditions (even the smallest deposit such as a hair may cause a leak).
Install only O-rings that are resistant to refrigerant R134a and corresponding refrigerant oil. The O-rings are color-coded to avoid mistakes (currently "red", "light purple" and "dark purple").
The O-ring dimensions -a- and -b- are different depending on installation location.
In addition to the color-coded O-ring seals, use is also made at the factory of black O-ring seals for certain connections.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.