Two problems related to electrical system have been reported for the 1998 Chevrolet Suburban. The most recently reported issues are listed below.
When it is raining water gets into the blower motor of the hvac and short out the motor which can cause the defrost, heat, or air to stop working which is potentially a hazard. Water and electronics are not really friendly together. It has happened many times.
Electrical system stays on after car is turned off.