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 MANUALSSAAB19909000 S, 4D HATCHBACK, 2.0 L, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMAUXILIARY AIR VALVE
1990 Saab 9000 S, 4D Hatchback, 2.0 L, Standard
Auxiliary Air Valve
1990 Saab 9000 S, 4D Hatchback, 2.0 L, StandardSECTION Auxiliary Air Valve
- Connect tachometer to engine. Start and warm engine to normal operating temperature. Turn A/C on and check engine RPM. Engine speed should initially decrease and return to normal idle speed.
- If RPM did not return to normal idle speed, check for battery voltage at auxiliary air valve harness connector. If voltage is present, check resistance between auxiliary air valve terminals. Resistance should be 40-60 ohms. Replace auxiliary air valve is resistance is not as specified. If voltage was not present, go to next step.
- Check Red wire between power distribution panel (A/C relay) and auxiliary air valve through the connector in engine compartment. Check Black ground wire. If wiring is okay, check operation of A/C relay.
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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.