so I threw a check engine, make a long story short i need a thermostat and some bull **** sensor. idk Does any one know how to change a thermo stat. Planning on doing it this weekend coming up but cant find any pics or anything.. Thanks guys :

 

im guessing you have a code p0128. i had that, the gm fix for it is to re-size the pins in the coolant sensor plug (basicly make them fit tighter). no more code now.