The multi-band antenna is on the roof of the vehicle. The antenna is used for AM-FM radio, OnStar, the SiriusXM satellite radio service system, and GPS (Global Positioning System), if the vehicle has these features. Keep the antenna clear of obstructions for clear reception.
If the vehicle has a sunroof, and it is open, reception can also be affected.
Radio Reception
Audio PlayersEngine Block Cleaning and Inspection Engine Block
Special ToolsEN 8087Cylinder Bore GaugeEN 28410Gasket RemoverFor equivalent regional tools, refer toSpecial Tools.Cleaning ProcedureRemove any old thread sealant, gasket material or sealantusingEN 28410remover.Clean all the following areas with solvent:Sealing surfacesCooling passagesOil passagesBea ...