[93 98-03, 900 94-98]
A special thanks to Fred Frigo for contributing this info.
During normal operation, after the car has been running for several minutes the temperature gauge should be at the midpoint between L and H, almost completely horizontal. My temperature gauge, rose much less than expected, and over time seemed to barely rise above L. The operation of the heater was normal indicating that the thermostat was not faulty. Replacing the Engine Coolant Temperature Gauge Sensor solved the problem. To replace the device, unplug the cable, then remove the sensor from the engine block. When the sensor is removed, coolant will flow out, so it is a good idea to have the new sensor close by, so it can quickly be inserted into the hole where the old sensor is removed from. After the sensor is tightened, attach the cable to the connector. The Engine Coolant Temperature Gauge Sensor is available from the Saabsite for $27.50. (Part # 9182205)

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