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Joined: 07 Apr 2008
Posts: 145

PostPosted: Tue Oct 10, 2017 8:23 pm    Post subject: air con problem Reply with quote

while having a service I got my car regassed .it had a new pump when I bought the car but has never worked properly . this is what happens when I turn the air con on full it seems to blow out cool air for a couple of seconds and then a flap seems to close off .any ideas also it dosent blow as strong as the cold air (heater blower) thanks
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Joined: 20 Apr 2014
Posts: 670
Location: Bedfordshire

PostPosted: Tue Oct 10, 2017 9:33 pm    Post subject: Reply with quote

You really need to work through the complete system as there are so many variables.

Tore's excellent overview is a good place to start.

993 C2 Aventura
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Joined: 13 May 2010
Posts: 561
Location: Oslo, Norway

PostPosted: Wed Oct 11, 2017 5:25 am    Post subject: Reply with quote

Pretzel, thanks for the reference.

I would guess this is a vacuum leak, causing the resirculation flap to not open when needed.
If you turn the temp setting to minimum, the CCU will resirculate the cabin air to get down to the desired temperature as quickly as possible.
The fresh air and mixer flaps is servo operated, and it takes 5-6 seconds for them to close. If the resirc flap is not opening, the fans will have nowhere to draw air from, and the air volume is significantly reduced.
Check the vacuum hose connections on the flap actuator and on the valve in the luggage compartment. Pics and details can be seen on this page:

'95 993 C4

Bergvill F/X
Porsche electronics specialists, products and repair services.

Last edited by ToreB on Wed Oct 11, 2017 9:43 am; edited 1 time in total
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Joined: 07 Apr 2008
Posts: 145

PostPosted: Wed Oct 11, 2017 9:23 am    Post subject: air con prob Reply with quote

Thanks tore the headlight pack for the 993 i bought from you are fantastic
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