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 4WD PICKUP V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X65 - CHECK DUAL FUNCTION A/C PRESSURE SWITCH INPUT
1994 Ford F 150 4WD Pickup V8-351 5.8L
X65 - Check Dual Function A/C Pressure Switch Input
1994 Ford F 150 4WD Pickup V8-351 5.8LSECTION X65 - Check Dual Function A/C Pressure Switch Input
- Key "OFF".
- Unplug dual function A/C Pressure Switch (ACPSW) (also known as Refrigerant Containment/Fan Function Switch).
- A/C "OFF" (to prevent chance of short circuit).
- Start engine.
ACPSW View:
- Jumper ACPSW circuit to GND circuit at the ACPSW vehicle harness connector.
- Does the high speed fan come on?
Yes -- Key "OFF". ACPSW circuit is OK. Remove jumper. Reconnect ACPSW. Go to Heating and Air Conditioning to check operation of the medium pressure function of the dual function A/C pressure switch. If OK, return to Diagnostic Routines for other possible causes.
No -- Go to X66. X66 - Check Ground Circuit to ACPSW
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.