Question about 1995 Audi 90

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1995 Audie A90 Coolant Temperature Sensor replacement

The engine light on my 1995 Audie A90 (2.8 ltr V6) kept coming on, I took it to a Repair Shop and they diagnosed the problem as a faulty Coolant Temperature Sensor. I bought the new sensor and need to know where the old one is located in order to replace it with the new one. Could someone tell me the location of the Coolant
Temperature Sensor and any tips on how to replace it.

Thank you

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  • 3 more comments 
  • capoiallo Dec 09, 2008

    I need a more specific location, as there are a number of sensors in that general location, require assistance in identifying the right one... perhaps a picture would help. Also some replacement instruction as how to remove the old and install the new one.



    Thanks

  • Anonymous Mar 14, 2014

    engine coolant temperature sensor

  • Anonymous Mar 14, 2014

    where is the engine coolant temperature sensor located?

  • Anonymous Mar 14, 2014

    where's the engine coolant temperature sensor located?

  • Anonymous Mar 14, 2014

    where's the engine coolant temperature located?

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  • Audi Master
  • 1,779 Answers

It's located under the hood, driver side, upper engine area, mounted on rear of engine block behind cyl. head.

Posted on Dec 09, 2008

  • Curt Downs Dec 09, 2008

    U should disconnect battery cable (neg), note that u may loose some coolant, so make sure u top it off when done. Compare new sensor to old to help identify, remove wire to sensor, unscrew to remove then install new one. re-attach wire to sensor.

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Ask these people when you order the thermostat.

http://www.autopartswarehouse.com/shop_years/buick-lucerne-thermostat-2006.html

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Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
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  • Connect the negative battery cable to the battery.



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Coolant Temperature Sensor printpage_icon.gif



0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
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A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
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0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

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


0900c152801bfc3a.jpg enlarge_icon.gifenlarge_tooltip.gif

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

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