How many temperature sensor switches on 1.8 eco tech engine vauxhall?

The 1.8 Ecotec engine in Vauxhall cars typically has two temperature sensor switches. These switches are responsible for monitoring the temperature of the engine coolant and sending a signal to the engine control unit (ECU) when the temperature reaches a certain level. The ECU then uses this information to adjust the engine's operation accordingly.

The two temperature sensor switches in the 1.8 Ecotec engine are located in the following positions:

- Coolant temperature switch: This switch is located in the cylinder head and measures the temperature of the engine coolant. When the coolant temperature reaches 105°C, the switch closes and sends a signal to the ECU.

- Cylinder head temperature switch: This switch is located in the cylinder head and measures the temperature of the cylinder head itself. When the cylinder head temperature reaches 125°C, the switch closes and sends a signal to the ECU.

The ECU uses the signals from the temperature sensor switches to control the engine's cooling system. When the coolant temperature reaches 105°C, the ECU turns on the cooling fan. When the cylinder head temperature reaches 125°C, the ECU opens the thermostat and allows coolant to flow through the radiator.