9000 CDE V6-2962cc 3.0L DOHC (B308) (1995)
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The coolant temperature is continually registered by the Electronic Display Unit (EDU) control module. To reduce the load at high temperatures (and so
protect the engine from overheating), the A/C compressor is disconnected at a certain engine temperature.
If the engine temperature is lower than the temperature for A/C disconnection, the control module supplies battery positive voltage to pin 4 which is
connected via pressure switch and anti-freeze thermostat to the Trionic/Motronic control module which, when their conditions for A/C connection have
been met, ground the A/C relay.
4 cyl
6 cyl
A/C disconnected at
° C (° F)
119(246)
116(241)
connected at
° C (° F)
118(244)
115(239)
Parking Heater