temp sensor is top of my list 
+1
+2
p/n 6U0919501B TEMPSENDER PRICE 24.74
you will need to replace the O ring that goes with it
p/n N90316802 O-RING PRICE 0.91
+ VAT
that's the part numbers for an 8v ADY

edit: oh and FFS replace the sensor when your coolant is COLD!
