View Full Version : Sensor Identification

03-16-2015, 07:48 AM
Hoping for a little help identifying this sensor as I want to replace it before the motor goes into the car. Marked 3A in this image, there was no 3A in the parts list just 3.

I thought maybe the fan thermo switch but thought that was in the lower rad hose.


03-16-2015, 08:00 AM
and just realized i put this i the a4 not s4 section my bad.

03-16-2015, 08:33 AM
Well I'm an A4 guy, but I think 3 on that diagram looks pretty similar to what is my Coolant Temp Sensor, as for 3A, maybe some sort of water pump temp sensor?