Any reason not us use rigid (if your engine is out) or flexible cooper (engine in) tubing with soldered fittings? Then for those of us in hotter climates, and inside the console use the foam insulation from Home Depot that is used on hot water tubing to hopefully contain the heat so the cabin is cooler? Just a thought. I like the idea of the PEX because it's flexible...but is it compatible with fitting diameters for the heater core? You could also use the foam insulation on PEX as well if you have removed the old tubing.
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