I have a T6.1 which is 4 years old with 54k on the clock. Had the van last year, and is now converted. However, it only became apparent as the weather got colder, that the heater in the front only blows luke-warm air at best! The fan works fine and the air is sent to the places it should be, albeit always cold, and doesn't get warm enough to defrost the front window. I asked on a recent service if it could be checked, I was 'told' the 'pipes were getting warm' so it must be working! Anyone any ideas?? Thanks.