SAAB WIS ONLINE

Brief description, 4-cyl

Brief description, 4-cyl

The cooling system is pressurised with a cross-flow radiator and expansion tank. A new type of coolant is being used in all Saab engines from model year 02 that does not require changing during service.

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.

An auxiliary heater connected to the cooling system (only certain markets) also functions as a parking heater. Because the engine uses supplied energy much more efficiently, residual heat is lower. So, an auxiliary heater is used to quickly make the climate of the passenger compartment comfortable. It is of the same make and function of that previously used on 9-3 4-cylinder Diesel, but with a much higher output (5 kW vs. the previous 3 kW). The auxiliary heater is mounted under the ABS unit and is connected in such a way that the engine coolant flow passes through the heater and is warmed before it reaches the heater core. This allows the passenger compartment to quickly warm to a comfortable level.

When the engine is running the heater receives a signal via a relay from the SID which, on the basis of the outside temperature, determines whether the heater is to start. Apart from this outside temperature criterion, the heater also has a coolant temperature sensor which, by sensing the temperature of the coolant, determines whether starting is to be allowed.

All 9-5s with diesel engines have dual radiator fans for efficient cooling. See DICE for a description of the function.