Fazi12321

Hi all, I've got a 2018 Q5 2.0 TFSI and over the last few months I've noticed a coolant leak. I dont know where it's going, but It has gone to below the min marking a couple of times resulting in me having to top it up. I've had the Waterpump & Thermostat changed - I thought it was going to resolve the issue, but unfortunately that hasn't helped. I also notice that my heating does not get very hot, it is luke warm at best & certainly not as hot as it used to be. Occasionally after a drive if I want to top up the coolant, when opening the expansion tank lid the level does rise and I get some leaking out from the overflow pipe. Anybody have any ideas what I could check or need to replace to resolve this? I'm pretty handy with the spanners so have no qualms with tackling this, but I was hoping somebody has tackled this problem before and was able to point me in the right direction before I start throwing parts at it. Thanks again