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 MANUALSMERCURY2009MARINER BASE, 2.5 7, AWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC CLIMATE CONTROL SYSTEMDESCRIPTION AND OPERATIONCONTROL COMPONENTSELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC)CONTROL SYSTEM OUTPUTS
2009 Mercury Mariner Base, 2.5 7, AWD
Control System Outputs
2009 Mercury Mariner Base, 2.5 7, AWDSECTION Control System Outputs
The EATC system has 4 control system outputs. When operating in AUTO mode, the control system outputs will be automatically adjusted by the HVAC module.
NOTE:
Each of the 4 control system outputs may be overridden by the passenger if desired.
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.