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 MANUALSEAGLE1990SUMMIT BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - MANUALTESTINGAIR THERMO & AIR INLET SENSORS
1990 Eagle Summit Base, Standard
Air THERMO & Air Inlet Sensors
1990 Eagle Summit Base, StandardSECTION Air THERMO & Air Inlet Sensors
- Remove sensor connector from A/C compressor control unit (located above evaporator housing). See Figure. Using an ohmmeter, measure continuity between connector terminals. Resistance should be within specification. See AIR THERMO & AIR INLET SENSOR SPECIFICATIONS table.
- If resistance is not within specification, sensor is faulty and must be replaced. If within specifications and all other components test okay, replace A/C compressor control unit.
AIR THERMO & AIR INLET SENSOR RESISTANCE SPECIFICATIONS
| Sensor Temperature | Ohms | |
|---|---|---|
| Air Thermo Sensor | ||
| 32°F (0°C) | 11,400 | |
| 50°F (10°C) | 7320 | |
| 68°F (20°C) | 4860 | |
| 86°F (30°C) | 3310 | |
| 104°F (40°C) | 2320 | |
| Air Inlet Sensor | ||
| 32°F (0°C) | 3310 | |
| 50°F (10°C) | 2000 | |
| 68°F (20°C) | 1250 | |
| 86°F (30°C) | 810 | |
| 104°F (40°C) | 530 | |
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.