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.
Cold Weather Modulator
Hold modulator in closed palm of hand for about 15 minutes. Apply 16 in. Hg of vacuum to supply port of modulator. Compare with COLD WEATHER MODULATOR chart. Place modulator in container of ice water for 30-40 minutes. Apply 16 in. Hg of vacuum to supply port of modulator. See COLD WEATHER MODULATOR SPECIFICATIONS table.
| Color | Holds | Leaks |
|---|---|---|
| Black | Below 20°F | Above 35°F |
| Blue | Below 40°F | Above 55°F |
| Green | Below 50°F | Above 76°F |
| Yellow | Below 50°F | Above 65°F |
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.
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