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Evaporator Insulation IF THE IMAGE IS TOO SMALL, click it.
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.
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