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.
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HOMESERVICE MANUALSFORD1987TEMPO AWD L4-140 2.3L HSCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSTHERMOSTATIC AIR CLEANERTESTING AND INSPECTIONCOLD WEATHER MODULATOR
1987 Ford Tempo AWD L4-140 2.3L HSC
Cold Weather Modulator
1987 Ford Tempo AWD L4-140 2.3L HSCSECTION Cold Weather Modulator
1. Cool modulator to below the following temperatures by spraying with Refrigerant 12: black modulator, 20° F; blue modulator, 40° F; green modulator, 50° F; yellow modulator, 65° F. Allow sufficient time for modulator temperature to stabilize and modulator valve to close. Do not spray refrigerant with engine running, as any refrigerant drawn into the carburetor and burned in the engine will produce poisonous phosgene gas. Conduct test in well ventilated area.
2. Use a 24 inch length of 1/4 inch hose between cold weather modulator and vacuum gauge. Using an external vacuum source, apply at least 16 inches Hg vacuum to vacuum motor side of modulator and trap vacuum by pinching hose. The modulator must hold at least 5 inches Hg vacuum for 30 seconds. If not, replace modulator.
RENDER: 1.0x
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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.