Killapoo

I've got an issue with my 2011 A6 C7 3.0 Tdi the thermo fans will not come on and the air conditioner wont blow cool crisp air like it used to, I've had it re-gassed and that has not fixed it so i checked to see if the fan fuses in front of the windscreen were ok and they are fine so no problem with them. Where else can i look for a cause to my issue? Is there a relay i can check out or a module that could have failed? I've also checked the fuses within the cabin and they are all ok as well. Please can anyone shed some light on the situation as its summer here in Australia and all i want to do is take it out on the weekends without getting heat stroke from having no air con. Thanks for your time.