S3 not warming up inside

Abzz

Abzz

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I am a bit puzzled :think:
I have a 2017 S3 where the heater inside the car is very slow to warm up in the winter . This makes demisting or defrosting a slow operation in the cold mornings and using the heated seats a must!
at first i thought maybe the thermostat was stuck open (or more correctly not being instructed to close by the ECU) so I have connected up a reader watched the water temperature on the live data stream. On a cold day it rises quickly from 4 deg C to 100 where it settles in a 10 min journey . :shrug:
I also checked the oil temp using the lap timer and that rises to about 67 deg over the same period.
In the same journey the air coming from the climate control (set to 22 deg) is cold and only at the end of the journey, does it feel luke warm ??

I initially suspected the thermostat as the housing was replaced under warranty in the summer and i cant remember the car warming up being a problem in previous winters. now thinking maybe an airlock in the heater matrix??

Any ideas folks?
 
I've had similar temperamental issues, my garage changed the 4 temp sensors initially with no change.

IIRC there is a coolant flush procedure via vag com
 
Most likely a blocked heater matrix or valves to the HVAC system stuck closed.

Quite a few threads on here about it -not uncommon on the 8V platform.
 
JohnM100 said:
Most likely a blocked heater matrix or valves to the HVAC system stuck closed.

Quite a few threads on here about it -not uncommon on the 8V platform.
Click to expand...
Thanks John, yes am thinking something like that, but as OK last year and Audi dealer would have drained the system in the summer (when i didn't need / use the heater) to change the Thermostat housing, I am thinking maybe an air lock, so may try the flush first before replacing the matrix.
None of the threads on here point to a conclusion as to the cause ? (unless I have missed that one?).
Cheers
 
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