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Valve is broken
Posted by Nickshu (more from Nickshu) on Mon, 15 Apr 2002 08:19:23
In Reply to: hissing from motor under fog light, Dane, Sun, 14 Apr 2002 14:55:57
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The motor is basically a shop-vac reversed to blow air into the exhaust to dilute the emissions at startup. It is called the "Secondary Air Injection System"...a wonderful GM invention. Its only on the 2.3L non-turbos.
Anyhow, there is a black plastic valve which closes off the hose from the air motor to the exhaust to prevent exhaust from going back into the motor when it shuts off (once the car is warmed up). It has 2 - 1" hoses connected to it and also a vacuum line. Its located near the driver's side bottom corner of the radiator. The heat from the radiator breaks down the plastic and the valve cracks and begins to leak air when the system is operating...hence your hissing sound....a very common problem.
The valve is avaliable thru our site sponsors, such as thesaabsite.com and is about $30. Replacement is easy...although the hose clamps on mine were rusted and I had to cut them off with a Dremmel tool.
Hope this helps,
Nick
95 900S
93 900S
...Saabs since '86
nickshu@yahoo.com
posted by 24.160.25...
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