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You are right but today after 45 km still cool air at 23-24 C but when 25 C set I got worm air so there may be soome issue but don't know whete to find the couse of cold air from vents. I scanned golf with vcds and got some info from vcds Address 08: Auto HVAC
Fresh Air Blower Front:
Refrigerant Pressure And Temperature Sender:
1 Fault Found:
1048835 - Functionality limited due to Engine Control Module
P1719 00 [008] - -
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 4
Reset counter: 40
Mileage: 26679 km
Date: 2017.01.25
Time: 08:47:59
Voltage terminal 30: 14.2 V
Auxiliary heater: in stages-Enabling for auxiliary heater operation: Enabling stage 3
Auxiliary heater: in stages-Act.value: 1
Auxiliary heater: in stages-Specified value: 3
Auxiliary heater: in stages-Specified value for control: 3
do not know what part to replace