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 MANUALSFORD1994AEROSTAR AWD V6-245 4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSKM - WOT A/C CUT-OFF (WAC) A/C DEMANDKM55 - CHECK ACD CIRCUIT CONTINUITY TO LOW PRESSURE SWITCH
1994 Ford Aerostar AWD V6-245 4.0L
KM55 - Check ACD Circuit Continuity to Low Pressure Switch
1994 Ford Aerostar AWD V6-245 4.0LSECTION KM55 - Check ACD Circuit Continuity to Low Pressure Switch
- Key "OFF".
- A/C demand switch to "A/C ON".
- Disconnect Low Pressure (LP) switch.
- Measure resistance between A/C demand switch side of LP switch vehicle harness connector and chassis ground.
- Is resistance less than 5.0 ohms?
Yes -- Go to KM56. KM56 - Measure Resistance of LP Switch
No -- Verify operation of A/C demand switch. Refer to Heating and Air Conditioning. If OK, service open circuit. Reconnect all components. Re-evaluate symptom.
RENDER: 1.0x
NO RELATED
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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.