Common problems with 1999 Chevrolet Suburban vehicles include failed power door lock actuators, failed mode door actuators that cause poor air conditioning performance and erratically behaving instrument panel gauges. Additionally, worn bearings on the front or rear differentials can cause a grinding noise on some vehicles.
The power door lock actuators on 1999 Chevrolet Suburban vehicles are prone to failure, gradually working slower and less efficiently until they require total replacement. This problem typically manifests itself in higher-mileage vehicles that are in regular use.
A fault in the air delivery or temperature mode door actuator of the 1999 Chevrolet Suburban may result in incorrect air temperature or delivery. When this occurs, a fault code stored in the air conditioning module assists with diagnoses. This problem usually affects vehicles with average mileage of almost 150,000 miles.
After an average of about 100,000 miles, 1999 Chevrolet Suburbans are prone to developing erratically behaving speedometers or other instrument panel gauges. To repair this fault, send the vehicle to an authorized repair facility. Chevrolet has extended the warranty on some of these units to 70,000 miles or seven years.
Another common problem with the 1999 Chevrolet Suburban is an abnormal noise coming from the front or rear differential. Usually, repairing the issue requires a complete overhaul of the affected differential.