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VW Passat & Audi A4 1990-2000 Engine Coolant Temperature Sensor Repair Guide

Access our free Engine Coolant Temperature Sensor Repair Guide for VW Passat & Audi A4 1990-2000 through AutoZone Rewards. These diagrams include:

  • Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown
  • Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor’s wiring-1997 2.8L V6 connector shown
  • Fig. The Engine Coolant Temperature (ECT) sensor resistance decreases as the coolant temperature increases as shown in this graph of the ECM coolant sensor
  • Fig. When the sensor was placed in a cup of ice water, the resistance increased instantly
  • Fig. This Craftsman® 3/8 inch drive thin-walled, 12-point, deep-well socket can be used for removing a threaded coolant sensor
  • Fig. The Craftsman® socket slides over the sensor without risking damage to the electrical connector housing
VW Passat & Audi A4 1990-2000 Engine Coolant Temperature Sensor Repair Guide

Access our VW Passat & Audi A4 1990-2000 Engine Coolant Temperature Sensor Repair Guide by creating an account or signing into your AutoZone Rewards account. Once you sign in, follow these instructions to access our Repair Guides.

  • Add your vehicle in My Vehicles.
  • Enter your vehicle details.
  • Click the “View More” button, and then click “Vehicle Repair Guides.”
  • Select “Chassis Electrical” in the Table of Contents.
  • Select the chapter “Engine Coolant Temperature Sensor Repair Guide”.

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Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

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