Apologies. Just jumping in on this post since us petrol guys are left out on this "diesel only" webasto auxillary heating...
I've seen more modern VAG cars can be retrofitted with an electrical heater matrix which is slotted in the heater box. Is this possible?
Here's an example:
Item Specifics:2005 - 2009 - MK4 - 1.4 DIESEL - HEATER MATRIX - WITH AC - 3 PIN PLUG - PART NO 6Q0963235B - D0467976. POLO 2005 -2009 HEATER CORE. POLO 2002 -2005 HEATER CORE. IBIZA 2002 -2009 HEATER CORE.
www.ebay.co.uk