Coolant Temperature Sensor / Switch HVAC: Description and Operation

Coolant Temperature Signal

This signal is supplied to the A/CCM from the instrument cluster, the input being required to:
- Provide blower inhibit control , to avoid the system in heating mode delivering cold air when the coolant temperature is below 35 °C unless DEFROST is selected.
- To progressively increase the fan speed up to maximum blower speed during warm up control. To assist in the control of the outlet temperature.
- To avoid possible pump or valve damage caused by ice particles in the coolant.