99 Grand Prix thermostat replacement - 3100 engine

[Goulmassian]

I am trying to replace the thermostat on my 1999 Grand Prix.

I have removed the front bolt from the thermostat cover/housing and notice that the back bolt has a notch cut out of it and assume that I do not need to remove the bolt all the way out to get the thermostat housing off of the thermostat. BUT, so far it seems that I can not get the thermostat cover to clear the top of the thermostat becuase the exhaust manifold and heat shield are in the way. I need about another 1/4" of clearance before the thermostat cover will clear the top of the thermostat and come off.

I can't believe that GM was expecting anyone to remove the exhaust manifold to replace the thermostat or am I just missing something simple to get the thermostat cover off?!

Please help!

[BNaylor]

Try removing the exhaust crossover heat shield. The thermostat housing bolts are not that long. And use the right tools.