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.
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HOMESERVICE MANUALSSAAB1992900 L4-2118CC 2.1L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1992 Saab 900 L4-2118cc 2.1L DOHC
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1992 Saab 900 L4-2118cc 2.1L DOHCSECTION Description and Operation
Temperature sensor (NTC resistor)
The temperature sensor is screwed into the inlet manifold flange. Its function is to provide the control module with information about the temperature of the engine. The control module then regulates the quantity of fuel injected according to the temperature.
When starting from cold and during the first part of the warm-up period, the engine requires a much richer fuel-air mixture on account of the losses due to condensation in the combustion chambers and intake pipe.
As the temperature of the engine rises, the quantity of fuel injected is decreased proportionately.
The temperature sensor consists of a brass body which holds a resistor of NTC type. NTC (Negative Temperature Coefficient) resistors have a low resistance at high temperatures and a high resistance at low temperatures. The temperature sensor sends a continuous signal to the control module.
If the signal from the temperature sensor is interrupted, a signal will be simulated in the control module which gives a function on the assumption that engine temperature is +20°C (68°F).
The temperature sensor is screwed into the inlet manifold flange. Its function is to provide the control module with information about the temperature of the engine. The control module then regulates the quantity of fuel injected according to the temperature.
When starting from cold and during the first part of the warm-up period, the engine requires a much richer fuel-air mixture on account of the losses due to condensation in the combustion chambers and intake pipe.
As the temperature of the engine rises, the quantity of fuel injected is decreased proportionately.
The temperature sensor consists of a brass body which holds a resistor of NTC type. NTC (Negative Temperature Coefficient) resistors have a low resistance at high temperatures and a high resistance at low temperatures. The temperature sensor sends a continuous signal to the control module.
If the signal from the temperature sensor is interrupted, a signal will be simulated in the control module which gives a function on the assumption that engine temperature is +20°C (68°F).
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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.