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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 412 (HVAC CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS - (HYBRID))DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMSYMPTOM CHART

2010 Mercury Mariner Hybrid, AWD

Symptom Chart

2010 Mercury Mariner Hybrid, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the traction battery control module (TBCM)	Circuitry. TBCM.	REFER to HIGH VOLTAGE TRACTION BATTERY .
Insufficient, erratic or no heat	Engine cooling system. Heater core. Temperature blend door. Temperature control cable.	GO to PINPOINT TEST D .
The air conditioning (A/C) is inoperative	Fuse. Circuitry. A/C clutch relay. A/C compressor clutch. A/C compressor clutch air gap. A/C system discharged/low charge. Dual function pressure switch. Low charge protection switch. Passenger zone valve. Front evaporator thermistor. Function selector switch. Powertrain control module (PCM).	GO to PINPOINT TEST E .
The air conditioning (A/C) is always ON	Circuitry. A/C clutch relay. A/C compressor clutch air gap. Function selector switch. Powertrain control module (PCM).	GO to PINPOINT TEST F .
Temperature control is inoperative	Temperature selector. Temperature control cable. Temperature blend door.	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The blower motor is inoperative	Fuse. Circuitry. Blower motor switch. Blower motor relay. Blower motor.	GO to PINPOINT TEST G .
No operation in high blower setting	Circuitry. Blower motor switch.	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
No operation in lower speeds	Circuitry. Blower motor resistor. Blower motor switch.	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
No operation in some blower speeds	Circuitry. Blower motor resistor. Blower motor switch.	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
Incorrect/erratic direction of air flow from outlets	A/C vacuum reservoir tank. Function selector switch. Vacuum hose. Vacuum control motor.	GO to PINPOINT TEST H .

RENDER: 1.0x

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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.