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, General Precautions: O-Ring
- Only O-rings that are resistant to refrigerant R134a and the associated refrigerant oil may be used. Color coding of O-rings is no longer employed. Colored and black O-rings are used.
- Ensure inner diameter on seals used is correct.
Refer to AIR CONDITIONING .
Refer to the Parts Information.
- O-rings may only be used once.
- Before installing, coat the O-rings lightly with refrigerant oil (PAG oil).
When flushing components with compressed air and nitrogen, always extract the gas mixture escaping from the components with suitable extraction units (workshop extraction system).
After engine all service work, screw sealing caps (with seals) onto all connections with valve and service connections.
Before starting up A/C system. Pay attention to the vehicle-specific filling capacities. Refer to REFRIGERANT R134A CAPACITIES .
Do not fill refrigerant, extract the refrigerant present and refill the system.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.