i may have install it wrong,toward the engine or the fender.
when installing thermostat there is a small button on the thermostat which way on 2005 Buick LaCrosse
The larger bulbous area of the thermostat faces in toward the engine. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
thank you ,i've install it backwards,glad to have found this site.