While we are on the topic of coolant and cooling, what are the
various ideas for replacing the coolant pipes that run under the
van. I have a 1982 diesel and would like to replace them as I put
a new motor in. I am leaning toward copper (didn't most radiators
used to be copper?) but know that it can work harden. I know that
Goodyear makes some sort of rubber for about $8.00 per foot. Any
reason to change the diameter from what's under there now? Any
other ideas?

TIA
Myron Lind
81 Westy
82 Diesel getting a new "mechanical TDI"