Actuators

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.

N

Audi R8 42 (2007- )
Audi A8 4E (2002 -)
Audi A6 4F (2005- )
N175_4E_87_____1_0602_21_Funktion

Left heat regulation valve -N175

 

A   -N176

B   -N175

C   -V50

D   Coolant intake

E   Coolant return

 

 

The out-flow temperature is regulated by the operating and display unit -J255 via the pump/valve unit. This is located on the right-hand side of the air conditioner under the plenum chamber cover in the engine compartment.

The pump/valve unit comprises the coolant recirculation pump -V50 and the left/right heat regulation valves (-N175/-N176). The heat regulation valve, left -N175 regulates the coolant flow fed to the associated heat exchanger for the left side of the passenger compartment from the engine cooling circuit. The valve is operated by the operating and display unit -J255 by a pulse width modulated voltage signal. Based on the cyclic operation of the control unit in the operating and display unit -J255 the coolant flow to the heat exchanger can be matched precisely to the required heating output.

 

 

Measured value block 040

 

Display zone 1

 

Display zone currently not used

 

Display zone 2

 

The opening time calculated by the operating and display unit -J255 of the left heat regulation valve -N175 in percent

J Readout 0 % (valve permanently closed, e.g. with temperature presetting Lo for driver side)

 

Display zone 3

 

The opening time calculated by the operating and display unit -J255 of the right heat regulation valve -N176 in percent

 

J Readout 0 % (valve permanently closed, e.g. with temperature presetting Lo for driver side)

 

Display zone 4

 

Activation of coolant recirculation pump -V50 by the operating and display unit -J255

 

J  Readout Off (the pump is not activated, e.g. with temperature presetting Lo for driver and passenger side)

 

 

K Notes:

J With no current applied the valve is open. If a valve is defective the associated heat exchanger is fully supplied with coolant, so the full heating power output is safeguarded.

J A Air conditioner; Rep.Gr. 87; Removing and installing pump/valve unit

J A Air conditioner; Rep.Gr. 87; Checking pump/valve unit function

J A Current flow diagram; ELSA




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November 30, 2012
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