When I first had my DS converted to lpg the installer had the coolant lines doubling back from rhetoric heater unit to the vaporizer, this meant that with the heater off coolant would take the path of least resistance and bypass the vaporizer. .. which would turn it to a solid block of ice...
what I realised driving long hrs up to Qld was that I had cool air comming through my vents as the vaporizer was right next to the fresh air duct. got me thinking.
if copper pipe was used to T off from the Lpg and coiled in the fresh air vent would it create the same effect? does it need to be plumbed back into the lpg circuit and should the T be before or after the vaporizer?
clearly tampering with lpg systems is dangerous and voids insurance etc. but would it work?