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2003 Audi A4 1.8 Turbo Quatro (not a Cabriolet) Coolant Sensor
I can not find the coolant temperature sensor which was described to be in a difficult location between the engine and fire wall. I used very bright lights and reached in behind to blindly feel the sensor location and still could not find it. The engine was cold therefore I tried every means possible to find it. There is a sensor on the top of the engine very close to the fire wall that is white with a metal clip holding the female plug into the male sensor. It looks like it may be threaded or I have to remove 2 small screws to remove the sensor that maybe a thermal well??
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CHECK COOLANT LEVEL IN RADIATOR. BUT WAIT UNTIL THE ENGINE COOL DOWN. CHECK WATER PUMP.IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP WHEN CAR OVERHEATING IF CAR AT A STANDSTILL IN LONG TRAFFIC LINE OR MOVING SLOWLY.COOLANT TEMPERATURE SENSOR FAULTY.NOT TURNING ON COOLANT FAN.CHECK COOLANT FAN FUSE AND RELAY.IF ALL IS GOOD.HOTWIRE COOLANT FAN.IF COOLANT FAN DONT COME ON FAN MOTOR FAULTY.IF FAN COMES ON CHECK ELECTRICAL WIRE CONNECTOR FOR DAMAGE WIRES.
Do you want used or factory rebuilt?
If used, it depends on the mileage of the car that it was taken from.. Used engines typically cost you upwards $700, while rebuilt would hit thousands.
CTS is at the back of the engine, behind and below the passenger side cylinder head, beneath the intake pipe going from the mass airflow sensor to the throttle body. It's either black or blue in your car, has four wires coming off the connector plugged into the top of it, and has a retaining clip that holds it as well. Get a new clip when you buy the sensor - they're plastic and break easily.
The sensor you have described is the radiator coolant temp sensor, the one you want (that often becomes faulty) is located directly at the back of the engine on a pipe between the engine and the bulk head. It is very tight to get to. The sensor is usually green or black, you will need to use a very long flat blade screw driver to remove the 'c' shaped clip (I think its the same clip you would of seen on the rad) I reccommend you try and get a spare clip as they can be easily dropped! With the clip out you can ease the sensor up and out, its prob easier to leave the connector on untill removed. Replace the seal if possible. When refitting the new sensor ease it in gently to avoid damaging and put the clip in which ever way is easier (if i remember correctly the clip can go back in the other side to which it came out- this way is much easier!) Hope this helps.
Avoid doing it when the cars hot, and even if its warm release the pressure by undoing the coolant bottle cap carefully. You shouldnt lose too much coolant when changing sensor. Let me know if you want anymore info.
You're talking about the coolant temperature right? If so, it's likely to be a coolant temp sensor. They're known to go bad on the A4, and they're only around $20-25 from www.ecstuning.com. If you replace it and the problem isn't fixed, no harm done - sooner or later that sensor WILL go bad. The result is that most likely your thermostat got stuck open and will need to be replaced.
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