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 DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCLIMATE CONTROL SYSTEMFUNCTION SELECTOR VACUUM SWITCH
2010 Mercury Mountaineer 2WD V6-4.0L
Function Selector Vacuum Switch
2010 Mercury Mountaineer 2WD V6-4.0LSECTION Function Selector Vacuum Switch
Climate Control System
Component Tests
Function Selector Vacuum Switch
Connect a vacuum pump to the function selector switch vacuum supply port and try to pull a vacuum in each function selector switch positions. Follow the chart below, to determine which positions should and should not hold vacuum. If the vacuum pump can pull and hold a vacuum when the chart indicates no vacuum (NV), the switch is plugged. If the vacuum pump does not pull and hold a vacuum when the chart indicates vacuum (V), the switch leaks.
Vacuum Application Chart
V = Vacuum
NV = No Vacuum
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.