A/C Compressor Regulator Valve -N280-, REMOVING AND INSTALLING, AND REPLACING: Removing

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-- Discharge the refrigerant circuit. Refer to WORKING WITH A/C SERVICE STATION .

CAUTION:

There is a risk of damaging the A/C compressor if the refrigerant circuit is empty.

- Never start the engine with the refrigerant circuit empty.

-- Depending on the vehicle and component location of the A/C compressor, remove the components that prevent access to the A/C Compressor Regulator Valve -N280-. Refer to Refrigerant Circuit (vehicle-specific Service Information).

For vehicles where at least one of the two refrigerant lines and the A/C Compressor Regulator Valve -N280- cannot be disconnected and removed while the A/C compressor is attached to the engine.

-- Remove the A/C compressor. Refer to A/C Compressor (1 Of 2) / A/C Compressor (2 Of 2) (vehicle-specific Service Information).

For a vehicle where at least one of the two refrigerant lines and the A/C Compressor Regulator Valve -N280- can be disconnected and removed while the A/C compressor is attached to the engine (the A/C compressor is not removed).

-- Extract the refrigerant.

CAUTION:

Danger of frostbite due to refrigerant coming out under pressure.

Frostbite on the skin and other parts of the body is possible.

- Wear safety gloves.

- Wear protective eyewear.

- Extract refrigerant and open the refrigerant circuit immediately.

- If more than 10 minutes have elapsed since evacuating the refrigerant and the refrigerant circuit was not opened, evacuate the refrigerant again. Evaporation can cause pressure to develop in the refrigerant circuit.

-- Check the pressure in the refrigerant circuit once more via the A/C Service Station pressure gauge.

If the displayed pressure is larger than the ambient pressure (larger than approximately 1 bar (14.5 psi) absolute pressure), turn on the A/C Service Station and extract the refrigerant that is building up the pressure.

-- Disconnect one of the two refrigerant lines from the A/C compressor. Refer to A/C Compressor (1 Of 2) / A/C Compressor (2 Of 2) (vehicle-specific Service Information).

All Vehicles

NOTE:

This and the following images show the A/C Compressor Regulator Valve -N280- -B- on a "Sanden" A/C compressor type "6 SEU 14". The connector for the vehicle wiring harness connection on these A/C compressors is mounted directly on the A/C Compressor Regulator Valve -N280- -B-. The removal and installation of the A/C Compressor Regulator Valve -N280- -B- on other A/C compressors (other type and manufacturer, for example "Denso", the A/C Compressor Regulator Valve -N280-, for example, with a short wiring harness to the connector) may differ. The procedure is however the same, as described in the following for the A/C compressor manufactured by "Sanden" type "6 SEU 14".

Fig 1: Exploded View Of A/C Compressor Regulator Valve

Courtesy of AUDI OF AMERICA, LLC

-- If equipped, loosen the wire connection from the A/C Compressor Regulator Valve -N280- -B- for the connector to the vehicle wiring harness from the A/C compressor.

NOTE:

For an A/C compressor with an A/C Clutch -N25-, where the actuation of the A/C Clutch -N25- occurs via the same connector as the activation of the A/C Compressor Regulator Valve A/C Compressor Regulator Valve -N280- -B-, remove the corresponding wires from the connector. Refer to A/C Compressor (1 Of 2) / A/C Compressor (2 Of 2) (vehicle-specific Service Information).

-- Clean the A/C compressor in the area of the A/C Compressor Regulator Valve A/C Compressor Regulator Valve -N280- -B-.

-- Remove the circlip -A-.

-- Carefully pull the A/C Compressor Regulator Valve -N280- -B- out of the A/C compressor mount -C-.

-- Check the removed A/C Compressor Regulator Valve -N280- -B- and A/C compressor mount -C- for dirt.

NOTE:

If the screen -D- on the A/C Compressor Regulator Valve -N280- -B- or the A/C compressor mount -C- are heavily contaminated (for example with shavings or dark, sticky abraded material), this indicates damage on the A/C compressor. In this case, the refrigerant circuit is to be cleaned and the A/C compressor is to be replaced. Refer to A/C COMPRESSOR, REPLACING DUE TO LEAKING OR INTERNAL DAMAGE and Refer to REFRIGERANT CIRCUIT, CLEANING .

If the screen -D- on the A/C Compressor Regulator Valve -N280- -B- and the A/C compressor mount -C- are only lightly contaminated (with gray deposits from normal A/C compressor operation, for example), a malfunction on the A/C Compressor Regulator Valve -N280- -B- can cause the A/C compressor malfunction.