hi there all i have some sort of problem with my air con system, i know its cold but the temp reading shown on my dash is -40 which by any standard is not correct, also the heater does not seem to blow hot air out. The car has to be warmed up and driven for about half an hour before i even get a glimpse of warm air and does it quite weakly even on the highest setting. but when i turn on the windscreen de-mister it seems to blow at full blast and clears the windscreen in seconds. i have checked all the fuses and looked for any debris ect. I replaced the thermometer/sensor on the front bumper grille but no luck. could this be a coding issue because i had some coding done a while back and some coding was done as the temp reading when on the star was hotter than the sun! any advice would be a great help as im feezing my bits off in this weather!