Centralized coolant temperature control (Opel Vivaro A)

Coolant temperature sensor 1: One three-pin sensor is used to transmit the signal to the injection control unit and the coolant temperature gauge on the instrument cluster (figure 4.105).



Two contacts for transmitting coolant temperature information to the injection system control unit (contacts B E1 and B KZ) and one contact is used for indication on the instrument panel.

This system provides control of the electric fan of the cooling system via the injection system control unit. It consists of a single coolant temperature sensor that sends a signal to the fuel injection system, the electric cooling fan, the temperature gauge and the coolant temperature warning light on the instrument panel.

The injection system control unit, depending on the coolant temperature, controls the operation of the injection system, the relay for switching on the electric fan of the cooling system:

[Material copied from the portal: opelbook]

• the electric fan switches on at low speed if the temperature exceeds 95°C and switches off when the temperature drops to 85°C;
• the electric fan turns on at high speed if the temperature exceeds 95°C and turns off when the temperature drops to 85°C;
• the electric fan can also be turned on (low rotation speed) for air conditioning.

The indicator light is controlled by the fuel injection system control unit. The light comes on when the coolant temperature exceeds 110°C and goes out when the temperature drops below 105°C.