Coolant Temperature Signal

This input is required to provide blower inhibit control, to avoid cold air being delivered in heating mode when the engine coolant temperature is below 30 °C and provide progressive blower increase up to 60 °C. The signal is also used to switch the coolant pump off at temperatures below 30 °C to prevent ice forming in the coolant The input also monitors the temperature of the coolant delivered to the heater matrix to assist outlet temperature control.