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 MANUALSMERCURY1998VILLAGER GS, VAN CARGOREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICSYMPTOM TESTSTEST F: SUNLOAD SENSOR
1998 Mercury Villager GS, Van Cargo
Test F: SUNLOAD Sensor
1998 Mercury Villager GS, Van CargoSECTION Test F: SUNLOAD Sensor
- Check For Sunload Sensor Trouble Code
Turn ignition to run position (engine off). Perform self-diagnostics. See SELF-DIAGNOSTIC TEST . Record all codes displayed. If Code 52 is set, go to next step. If Code 52 is not set, go to TEST A . - Check Sunload Sensor Resistance
Turn ignition off. Remove sensor on left side of instrument panel defrost grille. Disconnect sensor connector. Measure resistance across sensor terminals. There should be some resistance. If there is any resistance, go to next step. If there is no resistance (zero ohms), replace sensor. Retest system. - Check Resistance Of Sensor Circuits
Ensure ignition is off. Disconnect EATC module connector C2. Disconnect sensor connector. Using ohmmeter, check resistance of following wires between EATC module connector C2 and sensor connector: Green/Black and Black. If ohmmeter reading is less than 5 ohms, go to next step. If reading is not less than 5 ohms, repair appropriate open wire(s). Retest system. - Check Circuits For Short To Ground
Measure resistance between known-good ground and following terminals at EATC module connector C2: Green/Black wire and Black wire. If resistance is less than 10,000 ohms, repair appropriate wire(s) for short to ground. Retest system. If resistance is more than 10,000 ohms, clear codes and perform self-diagnostics again. If sensor related codes return or inoperative sensor symptoms still exist, replace EATC module. Retest system.
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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.