Need Help - No heat from the blowers in Audi A3 2014

[Elaine]

Hi I’m having an endless problem with my Audi a3 (2014). The car drives like a dream but the heating just stopped working. The blowers/fans work fine... just blow out cold air. Over the last 2 months the car has been with 4 different mechanics including an Audi dealership. They replaced the timing belt and pump etc but it didn’t fix the problem. Apparently the heating matrix is in perfect condition and that’s not the problem. Last mechanic said that it may or may not be the head gasket and it may or may not need a new engine and to just get rid of the car. 
I love this car and am disappointed that I am not getting adequate guidance from the experts. 
Has anyone any thoughts on the potential problem? And is it worth bringing to another local garage to see if it can be fixed?