Brief Description
The cooling system is of the pressurized type with cross-flow radiator and expansion tank.
The water pump is on the right-hand side of the engine and driven by the crankshaft pulley via a multigroove belt. The thermostat is placed in a housing on the left-hand side of the engine.
The expansion tank is mounted in the engine bay on the left-hand side. It is connected to the coolant pump and the upper right-hand part of the radiator. The purpose of the latter connection is to vent the cooling system. The fluid in the expansion tank does form part of the circulation fluid.
The car is fitted with an electric radiator fan mounted behind the radiator. The fan has either one or two motors, each with two speeds: low and high. Cars without A/C have one fan motor while cars with A/C have two fan motors.
Scheme 1
The cooling system is of the pressurized type with cross-flow radiator and expansion tank.
The coolant pump and thermostat are located on the right-hand side of the engine. The coolant pump is driven by the crankshaft pulley via multigroove belt.
The expansion tank is mounted in the engine bay on the left-hand side. It is connected to the coolant pump, throttle valve and upper left-hand part of the radiator. Its connection to the throttle valve is for preheating while the purpose of the last-mentioned connection is to vent the cooling system. The fluid in the expansion tank does not form part of the circulation of fluid.
The car is fitted with an electric radiator fan mounted behind the radiator. The fan has two motors, each with two speeds: low and high.
Scheme 2
Operation With Ignition ON
When the ignition switch is in the ON position, the DICE uses the following information on the bus: One radiator fan (cars without A/C)
- Coolant temperature (bus from TRIONIC)
When the ignition switch is in the ON position, the DICE uses the following information on the bus
- Coolant temperature (bus from TRIONIC)
- A/C pressure
- Car speed (bus from MIU)
- Outside temperature (bus from SID)
- A/C system status (active/inactive)
The information is used by the DICE to determine whether the radiator fans are to be started or stopped.
To maintain idling speed constant, the DICE sends information on the estimated current consumption to the engine management system via the bus. The information is send 0.1 seconds before the DICE starts or stops the radiator fans. The estimated maximum current consumption of the radiator fans is
- 9 A, low speed
- 37 A, high speed
When the conditions for high speed are fulfilled, low speed should be active for 2 seconds before high speed is activated. If high speed is active and the conditions for stopping both low speed and high speed are fulfilled, high speed is stopped immediately and low speed is stopped after 2 seconds.
Note. High speed cannot be activated until 15 seconds after the ignition has been turned on.