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 MANUALSGEO1991TRACKER LSI, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESCOOLANT TEMPERATURE SENSOR
1991 Geo Tracker LSi, Automatic
Coolant Temperature Sensor
1991 Geo Tracker LSi, AutomaticSECTION Coolant Temperature Sensor
- Remove coolant temperature sensor. Sensor is located on right side of engine, below upper radiator hose.
- Measure resistance of coolant temperature sensor at designated temperatures. Replace if not within specification. See COOLANT TEMPERATURE SENSOR RESISTANCE table.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 14,650 |
| 20 (-7) | 8100 |
| 40 (4) | 4780 |
| 70 (21) | 2500 |
| 100 (38) | 1250 |
| 160 (71) | 400 |
| 210 (99) | 190 |
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.