The owner of a 2007-09 Pontiac Solstice GXP may come into your store complaining that the overheat warning lamp is on and/or that there is insufficient heat coming from the HVAC registers.
One likely cause for the overheating, General Motors said, is an airbound cooling system. The air frequently ends up as pockets in the heater core, which results in the lack-of-heat complaint. Installing a new check valve, part No. 20876185, into both ends of the coolant return hose should eliminate the trouble.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].