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.
Dual THERMACTOR Air Control Solenoid Valve
The function of each valve can be determined by externally energizing valve with vacuum lines attached. See THERMACTOR AIR VALVE OPERATION . Check resistance of each solenoid. Resistance should be between 51-108 ohms when checked at coil terminals. If the resistance is not within these values, replace solenoid.
| Airflow | (1) TAB Solenoid | (2) TAD Solenoid | ||||
|---|---|---|---|---|---|---|
| Upstream | On | On | ||||
| Downstream | On | Off | ||||
| By-Pass | Off | Off | ||||
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Use the Manual With the Right Hardware
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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.