1999 GMC Sonoma Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 GMC Sonoma
1999 GMC Sonoma Problems
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.
1999 GMC Sonoma Questions
Replaced file pump