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.
General Information: Notes
- All components of the refrigerant circuit submitted for quality observation are always to be sealed (use original sealing caps of original part).
- To date, the original parts (compressor, reservoir, receiver/dryer, evaporator and condenser) have been filled with nitrogen gas. This charging stops gradually or the charging pressure is so low that gas does not escape noticeably when opening.
- On vehicles installed with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (compressor always in operation as well), refer to REFRIGERANT CIRCUIT, GENERAL PRECAUTIONS .
- So that the compressor with A/C Compressor Regulator Valve -N280- (without A/C clutch) is not damaged when the refrigerant circuit is empty, it is equipped with a secured oil supply. This means that approximately 40 to 50 cm3 of refrigerant oil remains in the A/C compressor, refer to REFRIGERANT CIRCUIT, GENERAL PRECAUTIONS .
As original parts are sometimes stored for lengthy periods and at different locations within the spare parts organization, it is entirely possible that gas will escape from some parts and not from others on initial opening (even in the case of identical original part numbers). Sealing caps at original part connections are therefore to be removed carefully and the nitrogen gas allowed to escape slowly.
The refrigerant circuit is equipped either with a restrictor and accumulator or with an expansion valve and receiver/dryer.
Seal open connections and pipes (to prevent absorption of moisture).
Always replace the restrictor.
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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.