1990 C4 Common Problems
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All known issues: 1990 C4
Known issues reported for the 1990 C4
C4, C5 and C6 Corvettes rely on electric cooling fans. When a relay, fan motor, sensor, fuse or wiring fails, the car may overheat in traffic or with the A/C on but run fine on the highway.
C4 Corvettes have a digital or partly digital instrument cluster. With age, displays fade, flicker, go blank or show wrong readings. Problems are often caused by aging solder joints, failing display components, or poor connections.
Most reports involve the fully digital 1984–1989 cluster.
C4 and C5 Corvettes use electric motors to raise and lower the headlights. With age, the motors, their internal gears or bushings, and the control circuits wear out. A headlight may stay down, stay up, move slowly or move only on one side.
From the C4 onward, Corvettes have many electronic modules that draw small amounts of power with the car off. Add aging batteries, aftermarket accessories, or a module that doesn't go to sleep, and the battery can go flat in days or weeks. Storage without a maintainer is the most common cause.