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.
1988 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor
- Ensure engine temperature is greater than 176°F (20°C). Remove harness connector from coolant temperature sensor. Connect multimeter between temperature sensor terminal No. 1 and engine ground.
- Connect between terminal No. 2 and engine ground. For multimeter reading, see Fig 1 , Coolant Temperature Sensor chart. Connect multimeter between harness connector terminal No. 1 and ground, then between terminal No. 2 and ground.
- Turn ignition on. Multimeter should read 4.5-5.5 volts. If no voltage is present, repair break in wiring. If no voltage is present and no break in wiring is found, replace respective control unit that controls that temperature sensor.
Factory Service Tools
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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.