Take it to your favorite local auto mechanic and have the engine checked out first. It is literally easier and about the same price to swap engines as it is to swap timing chains. Unless you are a mechanic with a shop with tools, or a glutton for punishment, I would not attempt this myself.
SOURCE: 2002 Pontiac Grand Prix Thermostat
as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!
SOURCE: Does this engine have a timing belt or a chain ??
this engine has a timing chain, it is also one of the best engines GM builds.
SOURCE: 1999 grand am gt 3400 v6
If white smoke is coming out of your tail pipe is is burning antifreeze. However have it checked closely. While it could be a head gasket, the 3400 is noted for the intake gasket leaking. Have a pressure test done before you pay for something that you don't need.
Also there is a way to permanently repair the head gasket if it is a real leak as long as it still runs. Check out Barr's Leak head gasket repair and follow the directions to the letter. do not skip any thing. It works I have repair a dozen cars with this.
Hope this helps
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SOURCE: how can i replace the
remove the serpentine belt remove the center bolt with a strong 1/2" drive impact gun. some times the harmonic balancer will come off with out allot of trouble, if not rent a puller from ADVANCE auto parts or any other part store and you should get it off no trouble.
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