Overheating, need to change the thermostat?

Hi, I was reading your response to a 2004 buick rendezvous thermostat issue and I need help with my 2002. From what I have read, there are enough differences between the two 3.4L engines that do not make me comfortable enough to follow the 2004 directions.

My 2002 thermostat seems to be stuck open. The temperature doesn't pass the 1st hash mark on the gauge and because of that, the heater doesn't blow warm air. I see where the housing is, but am not sure exactly what I need to unbolt. I have changed thermostats in other vehicles without any issues, but I am intimidated. I don't want to unbolt stuff without knowing what the torque for tightening is and/if there are is any need to purchase gaskets, etc.

Can you walk me through the '02 process. I would rather spend the time and do it myself rather than have to take it to a mechanic and pay for the labor for a $15 part.

I am clear with your explanation, but what do I need to remove to get the housing off. I thought that I read that the throttle body needed to be loosened in addition to an exhaust crossover pipe? Are there concerns about any gaskets there or not? From what I saw on my vehicle, I dont think I can get to the housing bolts without removing some stuff.

Need instructions on removal and installation of thermostat