Well, unless I am looking at the pic wrong, there is no back bolt.....it should be two front ones, one on top and one on bottom
I have attached the directions I have.
Also, looks like you may have some recalls on your vehicle. The dealer may fix these for free. Please contact the dealer service department, give them the VIN number of your car and have them check on these to see if they apply to you.
Remove the air cleaner and duct assembly.
Drain the coolant until the coolant level is below the thermostat.
Remove the radiator hose from the thermostat housing.
Remove the thermostat housing bolts and clean any sealer from the bolt threads.
Remove the thermostat housing and gasket.
Remove the thermostat.
Clean the mating surfaces. Installation Procedure
Install the thermostat.
Install the thermostat housing and gasket.
Install RTV sealer (GM P/N 1052366 or the equivalent) to the thermostat housing bolt threads. Notice: Refer to Fastener Notice in Service Precautions.
Install the thermostat housing bolts.
Tighten the bolts to 25 mm (18 ft. lbs.) .
Install the radiator hose to the thermostat housing.
Install the air cleaner and duct assembly.
Fill the cooling system.
Inspect the cooling system for leaks. Repair as necessary.
Wednesday, November 19th, 2008 AT 8:35 PM