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Hi Bob,
The engine compartment is indeed sealed, and that's good. However, there is a sealed hole in the engine tin where the electric engine compartment blower discharge duct passes through to get to the heat exchangers. When you backdate the heat, usually that hole is eliminated, and indeed the whole electric blower and duct too. I decided to leave the blower in place along with its discharge duct, and the sealed hole. This lets the blower suck air in through the condenser, and blow it out on the ground. The SSI heat exchangers only get air blown into them by the engine cooling shroud main fan. I also have foot well blowers to boost the heat flow.
Dave
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Dave McKenzie
1984 Carrera 3.2
1984 928S Automatic
2001 996TT
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