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.
1985 Buick Skylark Custom, 2.8 W, StandardFACTORY OEM SERVICE PROCEDURE
Vacuum Motor Test
- Remove air cleaner from vehicle. Disconnect vacuum hose from vacuum motor. Apply 20 in. Hg vacuum to motor and pinch off hose. Vacuum should not leak down more than 10 in. Hg in 5 minutes. If vacuum motor does leak down, replace it.
- Connect a vacuum pump to vacuum motor. Apply specified amount of vacuum to vacuum motor to open or close heated air door. If door does not open or close at specified vacuum, replace vacuum motor.
AIR CONTROL DOOR OPERATING VACUUM
| Application | Vacuum In. Hg |
|---|---|
| General Motors | 7 |
Factory Service Tools
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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.
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