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.
1990 Geo Tracker L4-1590cc 1.6LFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
REMOVAL:
1. Disconnect negative battery cable, and drain cooling system.
2. Disconnect connector from Coolant Temperature Sensor.
3. Remove Coolant Temperature Sensor from manifold.
INSTALLATION:
1. Clean mating surfaces of intake manifold and Coolant Temperature Sensor.
2. Use a new gasket.
3. Install Coolant Temperature Sensor in intake manifold.
4. Tighten to 35-55 N-m (25.5-39.5 lb. ft).
5. Connect the connector securely.
6. Refill cooling system.
7. Connect negative battery cable.
1. Disconnect negative battery cable, and drain cooling system.
2. Disconnect connector from Coolant Temperature Sensor.
3. Remove Coolant Temperature Sensor from manifold.
INSTALLATION:
1. Clean mating surfaces of intake manifold and Coolant Temperature Sensor.
2. Use a new gasket.
3. Install Coolant Temperature Sensor in intake manifold.
4. Tighten to 35-55 N-m (25.5-39.5 lb. ft).
5. Connect the connector securely.
6. Refill cooling system.
7. Connect negative battery cable.
Factory Service Tools
Use the Manual With the Right Hardware
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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.