The driveshaft bearings on higher mileage vehicles may become noisy.
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Most reported Porsche 944 problems
Due to a broken plastic link at the servo motor for the heater control flap, the interior temperature can become wildly erratic.
Due to a failed resistor pack, the HVAC fan may only operate on the high speed setting.
Corrosion/moisture at the throttle position sensor can cause performance issues relating to low boost.
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.
Air leaks at the manifold gaskets can cause engine misfire (especially at idle) or black smoke under load.
Aged brake fluid can cause numerous problems and should be replaced regularly.