SAAB WIS ONLINE

Brief description

Brief description

The cooling system is of the over-pressure type with cross-flow radiator and expansion tank.

The coolant pump is positioned on the right side of the engine and is driven by the crankshaft via a multigroove V-belt. The thermostat is positioned in a housing on the front right side of the cylinder head.

The expansion tank is located on the left in the engine compartment. The tank is connected to the coolant pump and to the upper right part of the radiator. The last mentioned connection is designed to bleed air from the cooling system. There is also a connection for bleeding air from the engine. The coolant in the expansion tank circulates through the system.

Radiator fan

DICE controls the cut-in and cut-out of the radiator fan. Depending on the market, the car will be equipped with a 1-speed or 2-speed fan.

On cars with a 1-speed fan, DICE controls the cut-in/cut-out of the radiator fan.

On cars with a 2-speed fan, DICE determines if the fan should run at high or low speed.

DICE uses the following information to control the function:


- Coolant temperature

- A/C pressure

- Outside temperature

- Vehicle speed


Auxiliary heater

Due to the high efficiency of the diesel engine, it produces significantly less excess heat than a petrol engine. This means that the engine and the cab is heated slower or, at extreme cold weather, does not reach sufficient temperature.

In order to correct this problem, the diesel engine will in some markets be equipped with an auxiliary heater that will assist the engine in reaching sufficient temperature. It is also intended to assist the engine during starts in extreme cold.

The auxiliary heater is located on the bulkhead in the engine compartment and is connected in a manner so that the engine coolant flow passes through the heater and is heated before it reaches the heater. This results in quick heating of the cabin to a comfortable temperature.

The heater receives a signal via a relay from SID which decides based on the outside temperature if the heater is to start. In addition to this outside temperature criteria, the heater also has a coolant temperature sensor which, by sensing the coolant temperature, decides if start is allowed.