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.
2008 Saturn Astra L4-1.8LFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor/Switch (For Computer): Locations
Powertrain Component Views
Engine - Right Front (2H0)
1 - Camshaft Position (CMP) Actuator Solenoid Valve - Exhaust
2 - Engine Oil Pressure (EOP) Switch
Engine - Rear (2H0)
1 - Fuel Injector 1
2 - Fuel Injector 2
3 - Fuel Injector 3
4 - Fuel Injector 4
5 - Battery
6 - Mass Air Flow (MAF) / Intake Air Temperature (IAT) sensor
Engine - Left Side (2H0)
1 - Ignition Control Module (ICM)
2 - Camshaft Position (CMP) Sensor - Intake
3 - Engine Coolant Temperature (ECT) Sensor
4 - Heated Oxygen Sensor (HO2S) 1
5 - Camshaft Position (CMP) Sensor - Exhaust
2 - Fan Control Module (Relay)
Coolant Temperature Sensor
1 - Coolant Temperature Sensor
Cooling Fan-Single
1 - Cooling Fan Motor Connector
2 - A/C Compressor Clutch Connector
Cooling Fan
1 - Fan Control Module (Relay)
2 - Fan Control Module (Relay)
3 - Cooling Fan Motor Connector
4 - A/C Refrigerant Pressure Switch
Cooling Fan
1 - Fan Control Module (Relay)
2 - Fan Control Module (Relay)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.