Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
Here are the instructions for the thermostat. Please let me know if any of it is not clear, thanks
Install the thermostat.
Install the thermostat housing and gasket. Notice: Refer to Fastener Notice in Service Precautions.
Sorry, let me give you this as well.
EXHAUST CROSSOVER PIPE REPLACEMENT REMOVAL PROCEDURE