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.
A/C System, Starting After Charging Refrigerant Circuit
There is a risk of damaging the A/C compressor. Refrigerant oil may accumulate in the compression chamber when the A/C compressor is removed.
- After installing a new A/C compressor or filling with fresh refrigerant oil, turn the A/C compressor 10 times by hand before installing the ribbed belt.
-- Start the engine with the A/C compressor switched off (version with A/C clutch).
-- Set the A/C compressor to minimum output, such as "ECON" mode or A/C off (version with no A/C clutch with regulator valve).
-- Wait until idle speed has stabilized.
-- Switch on the A/C compressor and operate the system for at least two minutes at idle speed.
Risk of damaging the A/C compressor or the A/C service station.
A short circuit between the high and low pressure side is possible when opening the valves with the A/C system is on.
- Never open the valves in the high or low pressure side when the A/C system is on.
-- If necessary, check the pressures in the refrigerant circuit using the A/C Service Station.
-- Turn off the engine.
-- Unscrew the hand wheel at the quick-release coupling adapter.
-- Disconnect the charging hose from the refrigerant circuit.
-- Screw the protective caps back on.
NO RELATED
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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.