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Having a similar issue with my GTI whereby the passenger side vents can blow out nice hot air but all those on driver’s side won’t get any more than tepid.

Tried doing the A/C reset trick but that didn’t make any difference.

Took it to dealership who said that heater matrix needs replacing but that wouldn’t be covered by the All-In extended warranty; unlike the thermostat housing which got replaced a few years ago when there was a coolant leak and they removed the dreaded silica bag.

I’d check the small print in the All In warranty. If you can’t see the heater matrix is excluded then I’d ask the dealer to show you where in the warranty documentation it’s excluded.

I'm having my matrix replaced next week at my dealers so I'm hoping they will have to drain the whole system which means they'll have to replace with G12 Eco.  As I've mentioned I took my bag out within 6 months of buying my car over 5 years ago.

Yeah you could be right to be honest - Only real way to tell is get until the car and see if there is play.

Just looking at other forums about this issue and came across a silicate cartridge you can get instead of a bag - looks like a small white cylindrical plastic object that goes inside the expansion tank and you can get them for about. £20.00 - supposed to be stronger than a bag but still need changing every few years - unclear as to if you just place it inside the tank or maybe there is specific tank for them - as been mentioned, VW put the bags in to help prolong coolant anti corrosion properties and unless you change to G12 Evo keeping to G13 without the bag could compromise this? Google VW silicate cartridge and you will see them - anybody have more info on this  ?

Got it an all in one service plan via the Black Friday 20% off offer. That's me fully covered for another two years!