How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Robert Your Own Question
Robert, UK Qualified Car Technician
Category: Audi
Satisfied Customers: 4716
Experience:  Fully qualified 19+yrs exp/self employed technician in the UK
Type Your Audi Question Here...
Robert is online now

car is audi a3 1800 turb0 2001 year.please tell me how many

This answer was rated:

car is audi a3 1800 turb0 2001 year.please tell me how many coolant sensors there are, and where to locate them on the car. reason being , my temp gauge does not work, thought id try changing sensors before thermostat.thank you.


Hopefully i can help..

There is plastic coolant flange on the side of the cylinder head "the opposite side to your timing belt" if you follow the large rad hose upto'll note there will be or should be sensor located on it,usually green or blue in colour.ive included diagram below of a 1.8T red arrow sensor/yellow thermostat.normally these sensors are just push fit after you put the new o ring on and held in place with the circlip you need to pop/slide back in to hold in notice that with the old one still on the car..with a flat head screwdriver pop the circlip out and pull the sensor out and refit with the new o-ring/clip in reversal of removal ... But yeah problems like that can be normally down to just that sensor itself so would be worth while replacing that..or a stuck thermostat can be quite common..but make sure the new sensor has the new o-ring and circlip

Customer: replied 3 years ago.

thank you, ***** ***** been nice to see engine in car, showing where sensors are , not engine out with nothing to tell front or back, and everything missing off it. Y ou are mechanic,and understand , I dont, which is why i spend £15.00 for your help, photo of not much help. I sked how many coolent sensors ,you show two arrows yellow and red I understand red but is yellow another sensor I must change.Cry


well givin even showing a picture of the engine you wouldnt see the sensor anyway nor the thermostat "yellow arrow" - there is only 1 sensor the one located in the red arrow" you see the green sensor on that engien above? that the sensor you need to look for - if there was more then one then i would of added that above - the photo there is more than helpful because just looking at the engine i would only be able to tell you which side it was on.. With the engine out it will give more of an idea what you need to look for on the engine itself - rather then just top view of it and a general area to check.. if you see where im coming from.... you know what side the gearbox is on.. then that side of the engine is where you need to look..follow the large coolant hoses up that side - you come to the coolant flange housing that sensor is on...thats what the picture above is angled at - the yellow arrow is you thermostat location..not really the best of jobs to get to..but trying the sensor being easier to get to is best place to start... if you want to send a picture of your engine in to me using the "paperclip icon on your message box" then you can do that..

Robert and other Audi Specialists are ready to help you