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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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Ventilation question
Hi guys
I dont understand why when the car is in motion and the ventilation levers are both at the most left position and the fan is closed, I feel the air that is coming in from outside through ALL the vents  Is there some sort of a shutter that should be closed or can be controlled so when I am driving I wont feel the air from outside?
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Porsche 928S 4.7L 1980 European redhead 
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08-24-2009, 07:22 AM
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928-Electrics Guy
Join Date: Jun 2007
Location: Phoenix AZ
Posts: 715
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It depends on year = on your year yes there should be. Maybe your vacuum flap actuators don't work - perhaps due to a vacuum leak - or no vacuum.
When in full operation mode do the flaps operate and change the airflow routing? One vacuum actuator controlls the water valve - it defaults to open with no vacuum and this means hot water to the heater core - if the other main evaporator flap is open you will get some airflow and in this case it will be hot - if other flap valves are open too you'll get hot air to multiple vents... only the defroster vents default to closed. Alan
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1994 928 GTS Black/Black Manual |
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08-24-2009, 12:09 PM
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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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So, in my case, the water valve is indeed open so I get hot air from multiple vents also from the defroster vents (the ones that in-charge of the wind shield).
When the flaps are in full operation mode the air goes through the correct vents. How can I close or check the main evaporator flap so I wont get the hot air into my face?
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Porsche 928S 4.7L 1980 European redhead
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08-25-2009, 02:16 AM
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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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I have downloaded the full shop manual however I am missing a lot of pages regarding the HVAC system.
does anyone have page 87-104 in the shop manual for a complete schematic of the vacuum system? Also, what is the location of the main evaporator flap that allows the air from outside to get into the car?
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Porsche 928S 4.7L 1980 European redhead
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08-26-2009, 08:10 AM
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Moderator
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Read my thread here and go to the end, it will answer how to close that Heater Valve Actuator.
Heat through Door Vents?
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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08-26-2009, 09:07 AM
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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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I dont have a vacuum test tule so I thought that I will connect a small air compressor that is also used for creating vacuum...However, I am afraid that the vacuum wont be too strong for the test so I was wondering how many BAR should be the vacuum so I wont damage the system?
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Porsche 928S 4.7L 1980 European redhead
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08-30-2009, 12:38 AM
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