Re: '91 9000 - No heat and it's getting cold - Saab 9000 Bulletin Board - Saabnet.com
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Re: '91 9000 - No heat and it's getting cold
Posted by BobS (more from BobS) on Thu, 23 Oct 2008 14:35:24
In Reply to: '91 9000 - No heat and it's getting cold, Chris Gwisdala, Thu, 23 Oct 2008 13:57:05
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There is a tmperature mixer valve or flap that controls the air temperature. If the mixer valve is not moving you could very well get nothing but cold air. A small DC servo motor under the cowl on the right side controls the valve. I had one stop working years ago, all it needed is have the commutator cleaned. Been working ever since. Enough crud had built up on the commutator to stop conduction between the brushes and commutator. Check the resistace across the motor connector contacts, should be well below 100 Ohms. This motor is a pain to get out, because the screw behind the motor is hard to get to.
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