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 Metro L3-61 1.0LFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
NOTE: Care must be used when handling coolant temperature sensor. Damage to coolant temperature sensor will affect proper operation of the fuel injection system.
REMOVE OR DISCONNECT:
1. Relieve coolant system pressure.
2. Ignition "OFF."
3. Air cleaner assembly.
4. Electrical connector.
5. CTS from throttle body.
INSTALL OR CONNECT:
1. Coat thread of CTS with sealer P/N 9985253 or equivalent.
2. Tighten CTS. Refer to SPECIFICATIONS.
3. Electrical connector.
4. Air cleaner assembly.
5. Replenish coolant system to proper level.
REMOVE OR DISCONNECT:
1. Relieve coolant system pressure.
2. Ignition "OFF."
3. Air cleaner assembly.
4. Electrical connector.
5. CTS from throttle body.
INSTALL OR CONNECT:
1. Coat thread of CTS with sealer P/N 9985253 or equivalent.
2. Tighten CTS. Refer to SPECIFICATIONS.
3. Electrical connector.
4. Air cleaner assembly.
5. Replenish coolant system to proper level.
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.