Water Temperature Switch - Aston Martin DB7 Workshop Manual

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Air Conditioning
Water Temperature Switch / Blower Motors
Water Temperature Switch
The water temperature switch (Fig. 1) is fitted to the
lower side of the heater matrix inlet pipe.
Figure 7.
It is connected to pin 21 of the ECM. The switch
contacts are open to prevent the blower motors
operating until the temperature of the water in the
heater matrix reaches 30°C. The water temperature
switch is overridden when cold air is demanded,
defrost mode is selected and fan speed 3 is selected.
Figure 2.
Key to Fig. 2
1. Earth-ground
2. Output to Pin 21 ECM
May 1996 8-25