Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
1992 Saab 900 L4-2118cc 2.1L DOHCSECTION Service and Repair
Temperature sensor
1 Remove the clips for the crankcase ventilation hose from the camshaft cover.
2 Remove the fuel pressure regulator complete with bracket from the cylinder head.
3 Unplug the temperature sensor connector.
4 Drain off about 4 liters of coolant so that it will not run out of the aperture when the temperature sensor is removed.
5 Unscrew the temperature sensor and remove it, using a 3/4" drive long socket.
Before refitting, thoroughly clean the mating surfaces and temperature sensor.
Also check the condition of the copper washer. Fit in reverse order.
Temperature sensor tightening torque: 20 Nm (14.8 lbs ft).
Note: Do not forget to reconnect the ground leads for the LH injection system at the point where the fuel pressure regulator is fastened to the cylinder head.
1 Remove the clips for the crankcase ventilation hose from the camshaft cover.
2 Remove the fuel pressure regulator complete with bracket from the cylinder head.
3 Unplug the temperature sensor connector.
4 Drain off about 4 liters of coolant so that it will not run out of the aperture when the temperature sensor is removed.
5 Unscrew the temperature sensor and remove it, using a 3/4" drive long socket.
Before refitting, thoroughly clean the mating surfaces and temperature sensor.
Also check the condition of the copper washer. Fit in reverse order.
Temperature sensor tightening torque: 20 Nm (14.8 lbs ft).
Note: Do not forget to reconnect the ground leads for the LH injection system at the point where the fuel pressure regulator is fastened to the cylinder head.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.