Just got my ac up and running - should be useful for three weeks or so per year in Seattle. Works great with a parallel flow condenser upgrade.

However, when I was taking things apart originally, the expansion valve was encased in some brittle, beyond-its-years foam insulation. I presume this is for some sort of temperature stability.

How important is it to replace this insulation?

What would be a good product to use?

BTW, 39.7 degrees F at the vent with R134a. OK, OK, not a warm day, but I am still happy.

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Erlend
1981 300D 202K daily driver