1998 GMC Safari Owner's Manual - Page 386

GMC dealers havethe facilities, trained technicians and up-to-date information to promptly address any concerns you may have. However, if a concern has not been resolved to your complete satisfaction, take the following steps: STEP ONE -- Discuss your concern with a member of dealership management. Normally, concerns can be quickly resolved that level.If the matter has at already been reviewed with the sales, service or parts manager, contact the owner of dealership or the the general manager.