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 MANUALSPLYMOUTH1994LASER RS TURBO, AWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSMISCELLANEOUS CONTROLSA/C CONTROL UNIT
1994 Plymouth Laser RS Turbo, AWD, Automatic
A/C Control Unit
1994 Plymouth Laser RS Turbo, AWD, AutomaticSECTION A/C Control Unit
- A/C control unit is located above A/C-heater unit. See Fig 1 . Disconnect A/C control unit electrical connector. Turn on ignition and A/C switch (Green light). Set temperature control lever to maximum cool and blower switch to high position.
- Using an ohmmeter, measure resistance between terminals No. 1 and 6, and terminals No. 5 and 7 on wire side of A/C control unit connector. See Fig 2 . Ohmmeter should read 1350-1650 ohms at 77°F (25°C).
- Using a voltmeter, measure voltage between terminals No. 2 and 3 on wire side of A/C control unit connector. With A/C switch in the on position, voltmeter should read approximately 12 volts. Turn A/C switch to off position. Measure voltage between terminals No. 2 and 8. Voltmeter should read zero volts.
- Using an ohmmeter, check continuity between terminals No. 3, 4, 8 and ground. Continuity should exist.
- Using a voltmeter, measure voltage between terminals No. 3 and 9. With engine coolant temperature at 172°F (78°C), voltmeter should read 12 volts. With engine temperature at 185°F (85°C), check voltage between terminals No. 8 and 9. Voltmeter should read zero volts.
- Turn A/C switch to economy position (Amber light). Measure voltage between terminals No. 3 and 10. Voltmeter should read 12 volts. Turn A/C switch to off position. Measure voltage between terminals No. 8 and 10. Voltmeter should read zero volts.
- If ohmmeter and voltmeter readings are within specification, replace A/C control unit.
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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.