2017 1.0 TSI with manual AC, drivers side heating (Vents and footwell) both cold and passenger side are hot. Classic symptoms of a blocked heater matrix, however the expansion bottle doesn't have the "mit silicat" label and the coolant is bright pink. We've had the car 4 or 5 months or so have only just realised as it's got colder weather that this is happening.

I have taken the side panel off the centre console and both the in and out pipes connected to the the heater matrix are hot so I am wondering if the issue is something else given that the pipes are hot, the coolant clear and there is no silicat bag present (I appreciate someone may have changed the coolant and tank to try and sort the issue although would still expect the coolant to discolour).

Any thoughts? Could some flap somewhere be broke or stuck so the hot air isn't being directed through?

An HVAC flap reset is worth trying:

Gaz

13 hours ago, Gaz said:

An HVAC flap reset is worth trying:

I thought about posting that but OP says he has manual AC - does manual AC have HVAC flaps that can be reset?

29 minutes ago, PetrolDave said:

I thought about posting that but OP says he has manual AC - does manual AC have HVAC flaps that can be reset?

That's a good point that hadn't crossed my mind. I suppose it'll depend on whether it's proper old school manual, or if the flaps are still motorised (and thus potentially resettable). A scan might help identify if there's a motor sticking, or another fault at play.

Apologies if my suggestion was a duff steer.

Gaz

No, unfortunately it's manual so no option to do a reset

no one have anything to add? Reading online it seems that it could be the actuator although unclear if the manual AC has one or two of these. If one I'm presuming it can't be that