Hello, My temp gauge in my A4 has been playing up for nearly 3 months now. First off it was hitting 90 degrees and then dropping all the way to 50 then to 90 then 70 then 90 and so on. I Put this down to the CTS being faulty so i changed that. After changing the CTS it still wasn't cured completely, it would raise to in between 70 and 90 but since this cold weather has come along its been sitting at 70 or just below 70. So i thought it was the thermostat being stuck open but one thing which is confusing me is that my heating is fine! I drive the car and after about 2 mins I have warm air coming though the blowers and after about 10 mins I have scorching hot air coming out the blowers! I tested the heat of the air coming out of the blowers with a cheap thermometer and it was showing the temp while being set to HI as 80 degreesor there abouts. I also tested the water in my header tank and that was around the 85 degree mark.....so could this just be a faulty CTS again and the new one I bought was dodgy? VCDS shows the temp the same as what my gauge shows but if i unplug the CTS that sits at the top of the engine VCDS shows the temp alot lower for example, when plugged in it was showing 68 degrees, when I unplugged the CTS it showed 38 degrees....are there 2 CTS's on the 2.5 TDI? if so where is the second one? VCDS shows no faults with the car.