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Originally Posted by DWBOX2000
Well I charged the system tonight and it’s running cold now. Hopefully it will hold. When I connected the gauge there was pressure so maybe a good sign.
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Aprox how much did you put in ? Congrats on initial positive results . Hopefully long term success also . Regarding the black foam from the vents . Do an internet search there is tons of info out there .
In a nutshell you have two blend doors in the dash HVAC housing . One controls AC/heat the other controls defrost/dash/floor air movement . Porsche/VW/Audi/BMW and others in their infinite engineering wisdom made the blend doors out of aluminum with holes in them .
The holes vary in size from aprox a quarter to half dollar in size . There are also rectangular holes . The OEM's then decided to cover the holes with foam . The foam they used is crap and breaks down . That's what comes out of the vents . When enough foam disintegrates the blend doors are basically useless . And of course this affects the efficiency of the system .