hi, i have a 2009 audi a4 2.0 tdi quattro 170bhp caha engine and it very rarely gets up to temperature. the needle usually gets upto about 80 mark and keeps dropping down slightly, very rarely will it get to 90 and if it does it drops back down shortly after. i plugged vcds in today after a 20 mile journey, vcds showed 70 degrees, i left the car to idle for around 20 minutes and the temp slowly got upto vcds 92 degrees, the needle was also showing 90 degrees, the fan never kicked in, i drove the car and the temp dropped down to vcds 69 degrees after a few minutes the temp needle also dropped down. points to meantion - the car is only getting 29mpg according to the dis. the fan never kicks in when the needle eventually showed 90 the reading on vcds was 80 degrees. can anyone help ?