hi My van has been with me for two winters now. yesterday me and the kids ventured off to hunstanton we used a campsite with an electric hookup so that we could have a fan heater. however on the way home we were still freezing. the heater is woefully inadequate. I have taken the matrix out and flushed it properly with a central heating powerflush machine and made sure that the hoses are not blocked..etc. I am about to add another heater matrix and blower as the engine produces enough heat. I think i need to replace the door seals aswell as they are draughty. Is this the same story for all the commer PB or is mine just faulty? has anyone else had same or done anything about it ?