GF83.57-P-2000PC Temperature Control Function

GF83.57-P-2000PC Temperature Control Function

MODEL 203.0 /2 /7 up to 31.5.01
- with CODE (580) Air conditioning (or Tempmatic for USA)
MODEL 203.0 /2 /7 as of 1.6.01
- with CODE (580) Automatic air conditioning
- up to Model Year 8
MODEL 203.0 /2 /7 as of 24.4.04
- except CODE (581) Comfort automatic air conditioning
- up to Model Year 8







Temperature control
A1 Instrument cluster
B10/6 Evaporator temperature sensor
B14 Outside temperature display temperature sensor
B31/2 Air humidity sensor (up to 28.6.06)
M2/5 Fresh air/air recirculation flaps actuator motor
M2/6 Left blend air flap actuator
M2/7 Right blend air flap actuator
N10/1 Front SAM control unit with fuse and relay module
N22 AAC [KLA] control and operating unit
N22b1 In-car temperature sensor
N70 Overhead control panel control unit
N70b1 In-car temperature sensor (up to 31.5.02 and as from 1.6.05)
CAN Controller area network bus class B (interior compartment) (CAN B)
KB A/C bus

The electronically controlled cooling, heating and ventilation system of the automatic air conditioning (AAC [KLA]) achieves the desired interior temperature as quickly as possible or holds it at a constant value by:
- the evaporator cooling the air
- the heating system heat exchanger heating the air

On vehicles from 1.6.02 to 31.5.05, the interior temperature is detected solely by the in-car temperature sensor (N22b1) in the AAC [KLA] control and operating unit (N22).

Heating mode
The in-car temperature sensor (N22b1) or the in-car temperature sensor (N70b1) measure the interior temperature. The outside temperature is recorded by the outside temperature indicator temperature sensor (B14).
The electronic control of the AAC control and operating module (N22) compares the various measured values with the temperature preselected at the temperature selector wheels.
As required, the position of the blend air flaps is either altered or kept constant via the left blend air flap actuator motor (M2/6) and the right blend air flap actuator motor (M2/7).

Cooling mode
The evaporator temperature sensor (B10/6) detects the air temperature at the evaporator's air outlet, the in-car temperature sensor (N22b1) or the in-car temperature sensor (N70b1) detects the interior temperature.
The outside temperature is measured by the outside temperature display temperature sensor (B14) and the air humidity by the air humidity sensor (B31/2) (up to 28.6.06).
The electronic control of the AAC control and operating module (N22) compares the various measured values with the temperature preselected at the temperature selector wheels.
As required, the position of the blend air flaps is either altered or kept constant via the left blend air flap actuator motor (M2/6) and the right blend air flap actuator motor (M2/7).