The orfice can be found either in the ac condinser or at a coupling sometimes at the radator but it is the ac line on the high side I do believe.
Trouble code P0118 means: Engine Coolant Temperature Circuit High Input Replace the Coolant Temp Sensor
the low beam part of the bulb could be bad.
Trouble code P0108 means:MAP Sensor Circuit High Input
i have an 03 grand prix and yes it was the blower motor resistor also check there is a fuse for fan low and fan high or something like that
burn high octane and keep it under 2000 rpm
the low and high beam are in one bulb. remove the battery and air filter and you will have access to them
Its on the stearing colume up real high some dash assembly might need removed
Check for a bad blower resistor at blower motor
A brand new Pontiac grand prix gxp gets around 19 miles per gallon on regular gas. In the city it gets sixteen and on the high way it gets around twenty five.