Oil commonly leaks from the valve cover gasket requiring replacement of the gasket.
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Most reported Saab 900 problems
Oil commonly leaks from the oil pan gasket requiring replacement of the gasket. Oil drops may be seen on the ground if the vehicle is parked over night.
Oil can leak from the oil pump cover seal. Oil will be visible at the bottom and left side of the engine, behind the crankshaft pulley. The seal will need to be replaced.
The APC Solenoid, also known as the boost pressure control solenoid, can fail creating an over-boost condition or a lack of boost from the turbocharger. This may be felt in an abrupt loss of acceleration under heavy load (climbing a hill, or quick acceleration).
Poor cooling from the air conditioning may be caused be leaks from the AC cooling lines at the AC compressor. Inspection of the system is recommended to isolate any potential leak.
My 900 turbo had an issue where the sunroof drains would get clogged with leaves and other debris, causing water to leak when it rained and the interior to flood. Upon some research and talking to other owners, I learned this is pretty common with this model. Using compressed air, you can put the nossel up to the drain and force air through the drain duct, thereby cleaning it out.