System overview, 4-cyl.
| System overview, 4-cyl. |
| 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.
| P bus and I bus |
In the Saab 9-5, all control modules are connected to buses with the exception of the ABS and SRS control modules. The buses are divided into the Powertrain bus (P bus) and the Instrument bus (I bus). Both buses are connected to the main instrument unit (MIU) and are electrically isolated. The P bus has a data transfer rate ten times higher than that of the I bus. All information emitted by a control module is available to all other control modules connected to the bus. The MIU ensures that the information which is available on one bus is also available on the other.
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