I had the same problem and just this second fixed it and this is my addition to the above reply.
The resister was actually situated behind the plastic motor housing and just up slightly to the right of the centre console near the radio housing, if you actually follow the wireing you will find a square ceramic resistor with the usual white plastic electrical plug that fits the male to the female, once located this is very very easy to remove, purchased a new one from vauxhall at £24.09 and fitted in 2/3 minutes and now have a full working heater.
Richard Prydderch
October 2006