A/C Compressor Regulator Valve -N280-, Removing And Installing And Replacing: Removing
-- Discharge the refrigerant circuit. Refer to WORKING WITH A/C SERVICE STATION .
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 .
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 .
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 refrigerant.
Danger or 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 elapse after extracting the refrigerant and the refrigerant circuit was not opened, extract the refrigerant again. Pressure can develop in the refrigerant circuit due to evaporation.
-- 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 .
All Vehicles
This and the following images show the A/C Compressor Regulator Valve -N280- -B- on a "Sanden" A/C compressor type "6 SEU 14". On these A/C compressors the connector for the vehicle wiring harness connection 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- with a short wiring harness to the connector) can differ. The procedure is however the same, as described in the following for the A/C compressor manufactured by "Sanden" type "6 SEU 14".
-- If equipped, loosen the wire connection from the A/C Compressor Regulator Valve -N280- -B- to the connector to the vehicle wire harness from the A/C compressor.
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 actuation of the A/C Compressor Regulator Valve -N280- -B-, remove the corresponding wires from the connector. Refer to A/C Compressor .
-- Clean the A/C compressor in the area of the A/C Compressor Regulator Valve -N280- -B-.
-- Remove the circlip -A-.
-- Carefully pull the A/C Compressor Regulator Valve -N280- -B- from the mount for the A/C compressor -C-.
-- Check the removed A/C Compressor Regulator Valve -N280- -B- and A/C compressor mount -C- for dirt.
If the strainer -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 COMPRESSOR, REPLACING ON ACCOUNT OF LEAKAGE OR INTERNAL DAMAGE and REFRIGERANT CIRCUIT, CLEANING .
If the strainer -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 at the A/C Compressor Regulator Valve -N280- -B- can cause the A/C compressor malfunctioning.