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.
Vacuum Test
First check operation of windshield wiper motor and lines by disconnecting inlet and outlet lines at pump and connecting these lines together (to by-pass pump). Operate engine at speeds up to 1000 RPM. Wiper should operate at full speed.
To check vacuum pump, disconnect pump outlet line at intake manifold and plug manifold fitting. Disconnect pump inlet line and connect a vacuum gauge at pump inlet fitting. Operate engine at 500 to 1000 RPM and note gauge reading. Vacuum should be approximately 14" to 19" Hg.
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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.