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 MANUALSVOLVO1987760 TURBO, 4D SEDAN, AW71LREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGELECTRICAL TESTSTEMPERATURE SENSORS
1987 Volvo 760 Turbo, 4D Sedan, AW71L
Temperature Sensors
1987 Volvo 760 Turbo, 4D Sedan, AW71LSECTION Temperature Sensors
- Using an ohmmeter, check temperature sensor in control panel for continuity above 65°F (18°C) only. Cool sensor below 65°F (18°C) and check that no continuity is present. If sensor test is not good, replace sensor.
- Check thermal switch on coolant hose for continuity between 86-104°F (30-40°C). Cool thermal switch. Continuity should be lost before temperature goes below 50°F (10°C). Replace switch if it does not test correctly.NOTE: The outer sensor resistance value can be checked from air intake. Remove windshield wipers, upper cowl support and cover from air intake. If replacement is necessary, See procedure in REMOVAL & INSTALLATION section of this article.
- Check that outer sensor resistance is 30-40 ohms at 68-86°F (21-30°C). If resistance is 65-100 ohms, replace sensor. Higher air temperatures corresponds to a lower sensor resistance.
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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.