Had exactly the same experience as you. After a longer drive on a hot 35 degree day the coolant light stayed on. Rang VW who said it's "because your car's new and it's the first time its been driven in heat" and advised to open the filler cap to purge some air out of the system.
Sure enough... pop open the bonnet, notice that the reservoir is very low, open the filler cap and after a big hiss the coolant level immediately normalises. This all happened 3 weeks ago and have kept an eye on the coolant level since. No further issues so far touchwood.
Hope it stays that way for you and me both
Happy motoring!
MY10 R36 Wagon Icelandic Grey
Jetta MY08 2.0FSI Reflex Silver
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