This switch assembly is used in many applications. Refer to Figures 1 through 4.

Refer to Figure 1.

This normally closed vacuum switch assembly is used on the 2.0L diesels. The switch is open when the vacuum pump output is more than 6.0 ±0.5 inches of vacuum. If the vacuum falls below 6.0 ±0.5 inches of vacuum the switch will close and light the low vacuum lamp.

Refer to Figure 2.

This normally closed vacuum switch assembly is used on the 5.0L 4-V HO manual transmissions. The switch is open when the manifold vacuum is more than 7.0 ±0.5 inches of vacuum. This switch will close when the manifold vacuum is less than 7.0 ±0.5 inches of vacuum, forcing thermactor air to dump.

Refer to Figure 3.

This dual vacuum switch assembly (S1 normally OPEN, and S2 normally CLOSED) is used in the 1.9L engine with MTX for controlling the shift light sequence. The switching point for the switches is 6.0 ±0.5 inches of vacuum.

Refer to Figure 4.

This dual vacuum switch assembly (S1 normally CLOSED, and S2 normally CLOSED) is used in the 5.0L 4-V HO with manual transmission and the 5.8L 4-V to provide an air bleed to the carburetor for the high altitude calibration. S1 will open above 5.0 ±0.5 inches of vacuum, while S2 will open above 10.0 ±0.5 inches of vacuum.

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.

Safety Warning

Distributor Modulator Valve Assembly

Use the Manual With the Right Hardware

When to See a Mechanic

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