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 MANUALSMERCURY1998MOUNTAINEER 5.0 P, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (DEFOGGER - REAR WINDOW)COMPONENT TESTINGWINDOW GRID
1998 Mercury Mountaineer 5.0 P, AWD
Window Grid
1998 Mercury Mountaineer 5.0 P, AWDSECTION Window Grid
WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Using a bright light inside vehicle, visually inspect wire grid from outside. A broken grid wire will appear as a Brown spot. Start and idle engine. Turn defogger on. Defogger indicator light should come on.
- Test for battery voltage at broad Red/Brown strips on rear window. A low voltage indicates a loose ground wire (pigtail) connection at ground screw. With negative voltmeter lead grounded, touch positive voltmeter lead to each grid line of heated rear window at its midpoint.
- A reading of approximately 5 volts indicates proper circuit function. If no voltage exists, circuit is broken between midpoint and hot side of grid line. A reading of 12 volts indicates circuit is broken between midpoint of grid line and ground.
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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.