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


1 - Connector of AC compressor regulating valve -N280


The Climatronic control unit -J255 activates the compressor by way of the AC compressor regulating valve -N280. The AC compressor regulating valve -N280 is activated by the Climatronic control unit -J255 such that the temperature of the air downstream of the evaporator reaches the specified value (around 2 to 5°C). In controlled mode the duration of the activation depends on the required cold output, the selected mode of the Climatronic control unit -J255 and the vehicle voltage. The activation does, however, last at least long enough for a mean current of 0.3 A to flow. For maximum compressor output, a maximum permissible current of 0.65 A flows via the AC compressor regulating valve -N280.



J Measured value block 001, display zone 1 shows the current flowing via the regulating valve -N280.

J If no pressure signal is detected by the refrigerant pressure/temperature sender -G395, the regulating valve -N280 must not be activated.

J If a compressor shut-off condition applies, the regulating valve -N280 cannot be activated (even during final control diagnosis). In measured value block 002, zone 1, the currently present compressor shut-off conditions are displayed.

J If multiple compressor shut-off conditions apply simultaneously, the conditions are either displayed alternatingly or only the shut-off condition assigned the highest priority by the Climatronic control unit -J255 is displayed.

J Under certain conditions, residual moisture in the refrigerant circuit may cause ice to form on the AC compressor regulating valve -N280. Such ice formation impairs compressor control; the evaporator is cooled excessively and ices up. Icing-up of the evaporator may give rise to various complaints.


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

A Current flow diagram


Site news

November 30, 2012
Content update We are starting big site update. We are sorry for bugs and missed content.
We are especially grateful for financial support of our site

User Name
Forgot your password?