9000 CSE V6-2962cc 3.0L DOHC (B308) (1996)
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The engine coolant temperature sensor, which is an NTC resistor, is linked to the Electronic Display Unit (EDU) control module. The control module
calculates the coolant temperature from the resistance over the resistor. The control module uses this information to control steps 1 and 2 of the radiator
fan, disconnect the A/C compressor at high engine temperatures and control the display on the engine temperature gauge.
A/C Disconnection
When the Automatic Climate Control (ACC) compressor is to be activated, the Electronic Display Unit (EDU) control module is supplied with voltage
from the ACC/A/C switch. The control module registers the engine temperature and at engine temperatures lower than those specified for A/C
disconnection, the EDU control module feeds the voltage on via a pressure switch and an anti-freeze thermostat which is connected to the
Trionic/Motronic control module. The engine management system grounds the A/C relay when the condition for A/C connection has been met.
Control Module Inputs