Thank you for your reply Ken. Yesterday I had to get in to town so after conferring with a mechanic or two we opted for 5/8" ID and 3/4 OD. This seems to be a common automotive application so the plan is to put pipe insulation on these auxiliary heater lines to boost the heat in the van. Thank you for your response. As long as I have to drive these old beaters, I will probably be looking for more help.
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Friday, October 26th, 2018 AT 1:01 PM