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 MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALENGINE COOLING FANTESTINGCOOLANT FAN THERMOSWITCH
1996 Audi A4 Base, Standard
Coolant Fan THERMOSWITCH
1996 Audi A4 Base, StandardSECTION Coolant Fan THERMOSWITCH
- Using Scan Tester (VAG 1551), monitor coolant temperature. Start engine. When engine coolant temperature is 198-207°F (92-97°C), turn ignition switch off and disconnect coolant fan thermoswitch. Check continuity between terminals No. 1 and 3 at coolant fan thermoswitch. If continuity exists, go to next step. If continuity does not exist, replace coolant fan thermo switch.
- Allow engine coolant to cool down to about 183°F (84°C) or less. Check continuity between terminals No. 1 and 3 at coolant fan thermoswitch. If continuity does not exist, go to next step. If continuity exists, replace coolant fan thermoswitch.
- Start engine and monitor engine temperature. When engine coolant temperature is 210-221°F (99-105°C), turn ignition switch off. Check continuity between terminals No. 2 and 3. If continuity exists, go to next step. If continuity does not exist, replace coolant fan thermoswitch.
- Allow engine coolant to cool down to about 196°F (91°C) or less. Check continuity between terminals No. 2 and 3 at coolant fan thermoswitch. If continuity does not exist, coolant fan thermoswitch is okay at this time. If continuity exists, replace coolant fan thermoswitch.
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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.