Unless you're a very experienced technician, it's better take it / send it in for service. Biggest problem would be to get the part in the first place.
See replated links below
http://www.a-body.net/forums/showthread.php?t=344
The thermostat on a 2003 Pontiac Grand Am 2.2L L4 Ecotec is replaced by removing the upper radiator hose and unbolting the thermostat housing. The thermostat can then be removed, a new gasket installed, and the replacement thermostat put in place.
in adults its done at L3 and L4 or L4 and L5
R3, D2, R2, U2, L3, R2, U2, L4, D3, U3, R4, D2, L3, R3, U2, L4, D2, L1, D1, R1, U1, R1, D1, U1, R5, U1, L1, D1, L5, U2, R4, D1, U1, L4, D2, R3, D2, R2, U2, L4, R3, U2, L4, D2, L1, D1, R1, U1, R5, D2, L1, U1, R1, U1, L4, R3, U2, L4, D2
NO DO NOT MIX YEARS it will not work 1991 -56B30 J-- L4- 1.6L TBI 0 M.T. -56B40 J-- L4- 1.6L TBI 0 AT 1992 -56B30 JLX L4-1590cc 1.6L TBI 2 MT -56B40 JLX L4-1590cc 1.6L TBI 2 A.T. -58B10 JLX L4-1590cc 1.6L MPI 4 CAL - MT -58B20 JLX L4-1590cc 1.6L MPI 4 CAL - AT -58B30 JLX L4-1590cc 1.6L MPI 4 FED - MT -58B40 JLX L4-1590cc 1.6L MPI 4 FED - AT
L4 is usually the size of the racquet handle. L3 is a standard 4 3/8 inch handle, while L4 is the larger 4 1/2 inch handle.
easiest way to see that is to ask at auto store or a mechanic, which way it goes
It is a 1.8liter engine that has 4 cylinders.
It is located on the side of the throttle body, which is the metal piece connected to the hose that goes to the air filter. It is held on with two screws and a clip for the wire. You cannot test it, only replace it.
They could be several things. Many different systems use an alphanumerical combination to record and file thinsg, and the terms L4 and L5 can refer to some specific things depending on what field you work in. Examples commonly used are the lumbar verebrae L4 and L5 in anatomy, and the LaGrangian points L4 and L5 in astronomy. The lumbar vertibrae L4 and L5 are the sciatic region of the back and are the most common area of disk compression failure, leading to chronic sciatica and other lower body nerve compromise.
It is a 1.8liter engine that has 4 cylinders.