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 MANUALSPONTIAC1983GRAND PRIX BASE, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMAIR CLEANER - THERMOSTATICCOMPONENT TESTINGVACUUM CONTROL TEMPERATURE SENSOR
1983 Pontiac Grand Prix Base, 5.0 H
Vacuum Control Temperature Sensor
1983 Pontiac Grand Prix Base, 5.0 HSECTION Vacuum Control Temperature Sensor
- Tape a thermometer close to the vacuum control temperature sensor located inside the air cleaner. Leave wing nuts off top of air cleaner so that top can be quickly removed to read thermometer during test.
- With engine cold, temperature below vacuum control temperature sensor specifications, check air control door in air cleaner. It should be in fully open position (open to outside air).
- Start engine. As soon as engine starts, door should move to full heated air position (closed to outside air). Watch air control door.
- When door reaches fully open position, quickly remove air cleaner top and read thermometer. Compare thermometer reading with specifications.
- If reading is not to specifications, perform vacuum motor test. If vacuum motor is okay replace sensor.
VACUUM CONTROL TEMPERATURE SENSOR SPECIFICATIONS
| Application | Heated Air Temp.: °F (°C) | Fresh Air Temp.: °F (°C) | |
|---|---|---|---|
| Buick | 70 (21) | 162 (72) | |
| Cadillac | 77 (25) | 123 (50) | |
| Chevrolet | |||
| Cavalier & Corvette | 86 (30) | 131 (55) | |
| Chevette | 80 (27) | 100 (38) | |
| All Other Models | 77 (25) | 123 (50) | |
| Oldsmobile | 77 (25) | 123 (50) | |
| Pontiac | 77 (25) | 123 (50) | |
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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.