1999 pontiac grand prixJanuary 22, 2013replace thermostat 3100 Share Tweet Pinterest Keywords:Grand Prixthermostat 1 thought on “1999 pontiac grand prix” Freeautomechanic January 22, 2013 at 7:39 pm Engine Coolant Thermostat Removal Remove the water outlet bolts. Remove the water outlet. Remove the water outlet gasket. Remove the thermostat. If you need the complete replacement procedure go Free Auto Repair Manuals Comments are closed.