The diesel Webasto will only run 30 minutes - programmed that way - and won't run again until the engine has been started at least once.... Not sure about the petrol version but it's likely to be the same.

There is the same limitation on the timer Vent function - it is to limit the drain on the battery to allow the car to still start.

I have fitted a remote to my Webasto - a $10 eBay remote tx and rx with a built-in timer is all you need. I did a writeup about it here somewhere - useless since Photobucket went mad...

__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)