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 MANUALSMERCURY2010MOUNTAINEER 2WD V6-4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSTEST KF: FAN CONTROL (FC) RELAYS
2010 Mercury Mountaineer 2WD V6-4.0L
Test KF: Fan Control (FC) Relays
2010 Mercury Mountaineer 2WD V6-4.0LSECTION Test KF: Fan Control (FC) Relays
PINPOINT TEST KF: FAN CONTROL (FC) RELAYS
Two Speed Fan Operation And Cooling Fan Motor Connector:
Low Fan Control (LFC) Relay Connector And High Fan Control (HFC) Relay Connector:
High Fan Control (HFC) Relay Connector And Powertrain Control Module (PCM) Connector:
KF1-KF2:
KF3-KF6:
KF7-KF10:
KF11-KF13:
KF14-KF17:
KF18-KF20:
KF21-KF22:
KF23-KF24:
KF25-KF26:
KF27-KF30:
KF31-KF33:
KF34-KF37:
KF38-KF39:
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.