The front control arm bushings wear out, resulting in alignment issues and squeaking and/or knocking noises from the front end. Worn bushings will require replacement.
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Most reported 1998 Volvo S90 problems
A "no start condition" and illumination of the Check Engine Light can be caused by a failing engine coolant temperature sensor.
A refrigerant leak may develop from the AC evaporator causing the AC to blow warm air. Verifying failure of this component is difficult. A good shop will use leak detection dye to verify a failing evaporator.
The sway bar bushings commonly wear out, causing a knocking noise from the front of the vehicle. Replacing the worn bushings should correct this concern.
Vibration problems from the rear brake rotors are common and require replacement of the pads and rotors, and the installation of special shims. The symptoms often occur when the brakes are used heavily from repeated braking, braking from high speeds, and braking while going downhill. The entire vehicle can vibrate and shudder, like it is being driven over train tracks.
The intake manifold gasket will often be a source of vacuum leaks. This will cause a rough idle and the Check Engine Light will illuminate. Replacement of the gasket is required to resolve this issue.