Heater question

[A4B6Cab]

Got a slight coolant leak from around the water pump area, so the last few times Ive used the Audi I keep the heater on 28 degrees (not max, as I have OCD and needs to be an even number) and strength on the blower of 4, or 6 bars. The last few days it’s been blowing cool air at me when set at 28 degrees, yep up it to 29 degrees (‘HI’ on the display) and it’s full blast hot air?

Any ideas guys?

[A4B6Cab]

Just an update if anyone finds this post. The issue was a knackered water pump not pumping the water around the system, new cambelt and pump has sorted it. £750 lighter