Date: Thu, 16 Jun 2005 18:13:13 GMT
From: th <>
Subject: Re: Hot air constantly

Skyclad wrote: > "th" <> wrote in message > news:6k%re.27334$ > > >>The heater principles on the 900 and the 900 are different. The 900 has a >>valve that changes the coolant flow into the heater core, the 9000 has >>constant cooolant flow through the core and the heater control changes the >>air flow. In this way it is easier to design an automatic air conditioning >>system as the regulation becomes faster (remember that the 900 only has Ac >>while the 9000 can have AC or ACC) >> >>-- >>th > > > Ah ha, and my 9000 does have ACC, so I have to find out what regulates > the air flow and where this is located. > I looked in the functional description in my Saab workshop manual for a 1992 9000 (having the ACC2 system). Both the air mixing valve and the air distribution valve seem to be located in the centre of the panel, behind the central air outlet and below the sun sensor. Functionally the air mixing valve is located between the fan and the heater core but how to get there I have not found out. The air mixing valve iactually consists of two valves: the lower valve controlling the air flow to the heater core and the upper valve controlling the air flow from the core. After the air mixing valve comes the air distribution valve which has five positions: Defrost: 135 degrees angle Heat: 112,5 - 135 deg. (defrost and floor) Floor: 90 degrees Up-down: 57 - 72 deg. (panel and floor) Ventilation: 45 deg. (panel only) Note also that the air mixing valve should go to cold position if the ACC is put in OFF mode -- th

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