So this morning when I got to work I sat in my car with it idling for a while to cool down a bit after a "steady" drive. I turned off the AC and moments later I noticed my temp gage going up and up. I switched the AC back on and it's started to come back to normal. I switched her off and left it the the whole day. Just got back from work and checked all the fuses, also let it idle for a while with the AC off to see if the temp rose again. It didn't and the fans are kicking in properly. I am stumped and not sure how it could of heppend. No fault codes. And it's a 2001 s3 amk. Any ideas?