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 4WD V6-4.0LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE TESTS AND ASSOCIATED PROCEDURESHVAC MODULE - DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) DTC CHART
2010 Mercury Mountaineer 4WD V6-4.0L
HVAC Module - Dual Automatic Temperature Control (DATC) DTC Chart
2010 Mercury Mountaineer 4WD V6-4.0LSECTION HVAC Module - Dual Automatic Temperature Control (DATC) DTC Chart
Climate Control System
DTC Charts
HVAC Module - Dual Automatic Temperature Control (DATC) DTC Chart
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart. PCM DTC Chart
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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.