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As a further note, I think there will always be some flow out the P2 vent as the bleed off the turbo is going to be pretty constant and has to go somewhere.
Based on another look at the diagram, it would look like you can only control the front bleed air by having it go through the heat exchanger for cooling or bypassing the heat exchanger giving you warm air or hot air flow if the gas heater is fired up.
Regards - Dave
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