how to change a thermostat on a 1999 pontiac grand am 3.4l
Hi aurura2006, Locate the thermostat housing by following the top radiator hose from the radiator to the engine block. You'll find a round casting connected to the intake. Simply remove those bolts and place a new thermostat in the housing, clean off the old gasket material and replace the gasket and sealer. Bolt it back on making sure to tighten the bolts evenly so you don't crack the housing. The trick is getting to the housing because the air intake system is in the way. Loosen the air intake system and pull it back out of the way. There are some small water coolant lines underneath that can be a pain to get off and back on. Good luck!
I HAD GREAT TROUBLE GETTING THE BACK BOLT OUT OF THE COVER FOR THERMOSTAT IS THERE A PARTICULAR TOOL WHICH COULD HELP IN THIS REMOVAL?