I would also like a proper answer from such people - "engine itnaa garam hojata hai ke aag lag jatee hai" -- hahahaha
Its all hearsay - if your cooling tins, seals etc are in place, the mechanicals adjusted good - clean inlet, perfect exhaust - Nothing will run happier than an air cooled VW on the highway.
If you think this engine will heat up - you need to see a turbocharged aircooled porsche - that engine holds 12 litres engine oil, huge fan, massive cooling tins, a fiery hot turbo and an intercooler in the engine bay, still it remains nice and cool on the highways - even under lead foot action.
Its like someone driving with a bad radiator and cap, rusted engine etc then complaining that the engine overheated.