Logic of naming actuators in VW-group is simple it contains "N" + actuator number. The actuator number is unique. Here you can find fitting location, connectors and some basic information about actuators.

To our mind, actuators information is reference, so there is only simple search by number.


Audi R8 42 (2007- )
Audi A8 4E (2002 -)
Audi A6 4F (2005- )
Audi Q7 4L (2007- )
Audi TT 8J (2006- )
Audi A4 8K (2008-)
Audi A3 8P (2003- )
Audi Q5 8R (2009- )

AC compressor regulating valve -N280


A and B - Connector of AC compressor regulating valve -N280 -N280


The electric AC compressor regulating valve -N280 is pushed into the compressor and is secured by a spring ring.

It forms the interface between the low, high and crankcase pressure in the compressor and is the precondition for clutchless operation.

The adjustment of the swash plate is effected by these different pressures.

That means, if a higher cooling power is required, for example, the regulating valve is activated by the Climatronic control unit -J255.

A pulse width modulated voltage signal moves the plunger in the regulating valve. The duration of the applied voltage determines the adjustment travel.

The adjustment alters the opening cross-section between the high pressure and the pressure in the crankcase of the compressor. The crankcase pressure increases and, by way of the piston stroke, effects a greater skew of the swash plate.


K Notes:

J If an inadequate vehicle voltage is applied, faults may occur in the air conditioning system, or it may fail altogether.

J If the regulating valve fails, the wash plate positions itself perpendicular to the longitudinal axis of the compressor such that the cooling function is disabled.

A Air conditioner; Rep.Gr. 87; Checking switch-on signal for AC compressor regulating valve -N280

A Current flow diagram; ELSA


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