Evaporator Insulation
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This foil-faced bubble wrap replaces the older foil bag of fiberglass, which always degrades & collects water. But it's necessary to prevent heat damage to the evaporator cover (which includes the HVAC vacuum reservoir), and to keep exhaust heat from counteracting the A/C. It's even more important with headers (which radiate MUCH more heat than manifolds), but this probably won't stand up to headers.

Owner caption March 2021 · Photo 0 of 5000