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 MANUALSFORD1994F 150 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSKM - WOT A/C CUT-OFF (WAC) A/C DEMANDKM3 - CHECK CONTINUITY BETWEEN WAC RELAY AND A/C RELAY
1994 Ford F 150 2WD Pickup L6-300 4.9L
KM3 - Check Continuity Between WAC Relay and A/C Relay
1994 Ford F 150 2WD Pickup L6-300 4.9LSECTION KM3 - Check Continuity Between WAC Relay and A/C Relay
- Key "OFF".
- Wide Open Throttle A/C Cut-Off (WAC) relay disconnected.
- Disconnect A/C relay.
- Measure resistance between the A/C relay output to the WAC relay at the A/C relay vehicle harness connector and the A/C relay input at the WAC relay vehicle harness connector.
- Is resistance less than 5.0 ohms?
Yes -- Reconnect WAC relay. Refer to Heating and Air Conditioning to check for proper input to A/C relay from B+, IGN RUN and A/C demand circuits; proper A/C relay operation, etc.
No -- Service open circuit. Reconnect WAC relay and A/C relay. 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.