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.
1989 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE
Cold Weather Modulator
Using a vacuum pump with gauge, apply 16 in. Hg of vacuum to motor side of modulator. Determine if modulator holds or leaks within the correct temperature range. See COLD WEATHER MODULATOR SPECIFICATIONS table.
COLD WEATHER MODULATOR SPECIFICATIONS
| Modulator Color | Holds Vacuum @ °F (°C) | Leaks Vacuum @ °F (°C) |
|---|---|---|
| Black/Normally Open | 20 (-6.7°C) | 35 (2) |
| Blue/Normally Open | 40 (4) | 55 (13) |
| Green/Normally Open | 50 (10) | 76 (24) |
| Yellow/Normally Closed | 65 (18) | 50 (10) |
Factory Service Tools
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.