Visibility, Defroster/defogger/hvac System, Heater Core March 1, 1979 NHTSA recall 79V061000 740 units THE FLUE OUTLET FITTINGS INSTALLED ON CERTAIN VEHICLES ARE TOO SHORT TO CONNECT THE INSULATING SLEEVE TO THE FURNACE OUTER CASE. THIS COULD ALLOW HIGH TEMPERATURES TO CONCENTRATE ON THE TRAILER WALL. Full recall details: the risk and what to do →