I have not double checked in a while but, the black rear vent already has a one way valve to let pressure out of the cabin. Turn Your AC on high and You should be able to walk around back and feel the air moving out. But, it is not in a large volume thus not a solution. I just use express window for about 5 minutes and express window up and it cools off fairly quick. Even quicker with the dual electric fans on radiator now. It used to take allot longer to cool cabin down but, AC jumps up colder faster.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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