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Date: Wed, 15 Jun 2005 19:29:06 GMT
From: th <someguynospamwhere.se>
Subject: Re: Hot air constantly


Craig's Saab C900 Site wrote: > "Skyclad" <Donotreplynospamaddress.com> writes: > > >>I have just purchased my first Saab two weeks ago, a 1990 9000 Turbo, I love >>it already! >>The person I purchased it from had by-passed the heater core because hot >>air would always >>be entering the cabin. The AC works fine when the core is by-passed. My >>question: is there >>flap (or flap motor) that could be faulty, thus not redirecting hot/cold air >>properly? >>I have searched quite a few sites for info with no luck and I have a Hayes >>manual ordered >>(not much use to me yet), any help is appreciated. > > > Did the previous owner say that the heater control valve itself was broken, > or just that the heater core would continuously heat the air flowing through > it and into the cabin of the car? When he 'bypassed' the core, what exactly > did he do? Did he disconnect the two hoses from the ports on the back of the > heater control valve (which poke through the firewall into the engine bay) > and plug them or join them together? > > I just did a heater control valve replacement job on my 1985 900i and you're > more than welcome to check out the web page covering it at > "http://nospam/~c900/heatervalve.html" to see if that helps at > all. With the one I replaced, the metal control shaft had broken off, so the > valve itself is probably still ok (I haven't thrown it out - going to use it > for a demo at a club meeting in the near future), but I don't think the > shafts are available to buy on their own. > 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

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