Due to a broken plastic link at the servo motor for the heater control flap, the interior temperature can become wildly erratic.
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Repairpal verified 1990 Porsche 944 problems
In automatic transmissions, the flexible hub at the engine flywheel may deteriorate and fail, causing a large amount of play in the driveline. This failure may be caused by prolonged engine oil leaks.
The driveshaft bearings on higher mileage vehicles may become noisy.
Due to a failed resistor pack, the HVAC fan may only operate on the high speed setting.
Air leaks at the manifold gaskets can cause engine misfire (especially at idle) or black smoke under load.
Engine shut down or a "No Start" may be caused by cracks at the DME (fuel pump) relay solder joints. Repairing or replacing the failed relay should correct this concern.
Suspension components (including control arms, boots, and ball joints) are critical and require regular inspection.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.
Aged brake fluid can cause numerous problems and should be replaced regularly.