Hi, folks.... first post looking for a bit of advice, so go easy with me.... I have an A3 2.0 tfsi (bwa engine) and the temp gauge is saying coolant is running about 70 degrees when on the move, but does climb back up to 90 when stood.... once i'm up to speed again it will drop back to 70 (ish). temp gauge is reading correctly, as i have looked with vcds and an infra red temp reader and all say the same within a degree or so. Are there 2 temp senders or only 1 ? i have replaced the temp sender unit (green top/ 4 pin)and it is still reading the same as before, confirmed with vcds and infra red. so i am hazarding a guess at saying thermostat is stuck open... Vcds did say on measuring blocks that stat was 100%, as i'm new to these engines, i don't know if the stat is electrically operated or not.... Or am i looking at a measurement that does not mean anything to this engine? If anyone has any ideas on this i would be grateful, as i have had a good hunt for info, but can't find anything conclusive... Many thanks, Phil.