Dazza Tough

Hi. I had a diagnostic test done for another issue, it did show climate control module 2 issues ;1st air quality sensor reads short to ground and 2nd coolant re circulation pump reads upper limited exceeded

Hi. My fuel gauge on my 2007 A6 2.7 TDI QUATTRO is playing up, over the last few months it works perfectly and then for some time it shows 0 miles on display and the gauge shows empty. I had it in the garage a few days ago to be diagnosed. The garage says after the diagnostic report , found short circuit in fuel send units - this is a saddle tank unit . Both fuel pumps senders require replacing VW/ Audi part only . They quoted me £485.74 parts , labour and VAT . When it went to the garage the gauge wasn’t working but since i got it back it’s working perfectly at present . Any thoughts ?/

The heating has stopped working correctly on my 2007 A6 TDI Quattro . On short journeys I have it on high but it blows only cold air , on longer journeys it would takes around 15 mins for the hot air to work but when I slow down in traffic it becomes cold air again . Any ideas what the issue is . TIA