One problem related to cruise control has been reported for the 1999 Chevrolet Astro. The most recently reported issues are listed below.
Had cruise control engaged prior to entering a reduced speed area and it functioned normally. After departing the reduced speed area, I engaged the resume function and the vehicle accelerated past the set speed and kept speeding up. I was able to control the vehicle with brakes although they got very hot and smoked severely. Attempts to turn off the cruise control failed, as well as turning off and removing the keys from the ignition. After successfully stopping the vehicle, I continued attempts to disengage the cruise control but any attempt to start the engine resulted in immediate racing of the engine. I examined the owner's manual and discovered that fuse number 6 was labeled "cruise module, cruise control switch, electromechanical mirror". The fuse was removed but the engine raced upon attempting to start it. I then discovered that fuse number 18 was labeled "vcm-ign 3, vcm-brake, 4wal, cruise stepper motor signal". Upon removing this fuse, I was able to start the engine, and it remained in normal parameters. I did notice that the antilock light was on, but believe this is related to the vcm-brake label on the circuit breaker. I was then able to continue driving the vehicle home, and will be contacting the repair shop to disable/remove the cruise stepper motor, as I refuse to chance another unintended acceleration event.