The exhaust flex pipe can fail causing excessive exhaust noise from the front/center area of the vehicle. The flex pipe is a flexible joint in the exhaust that allows for engine movement.
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Newest 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.
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.
Oil commonly leaks from the distributor o-ring requiring replacement of the o-ring. Oil will be visible on the front of the engine near the distributor.
The air conditioning expansion valve can fail causing poor, or no cooling from the AC system.
A weld for the catalytic converter mounting bracket and heat shield can fail. Rattling noise will be heard from the bottom/rear of the engine compartment.
The exhaust center muffler can fail causing excessive exhaust noise.
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).