Hi all, got a problem that's baffling me. Any advice most welcome. My td5 54 plate heats up really quickly and blows nice hot air out of the vents. Not the problem. My x reg td5 doesn't do what the other one does. It takes approx 15 miles before the temp gauge can be bothered to get its backside off the stop and eventually gets to just under halfway and stays there. Heat through the vents is not that impressive. Both vehicles don't use any water. Any suggestions?