Do you have a Webasto supplementary heater?
If you're not sure, look for a regulatory sticker on the underside of the bonnet. If you have, it may be worth checking this is running from cold starts, the diesel exhaust outlet is in the plastic sump tray and should issue a light smoke you can see easily with a torch at night.
My 3.0V6TDI is also too slow to warm up, tried two thermostats and later today will try another temp sender.
Last edited by snapdragon; 19th December 2011 at 12:57 PM.
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