Chevy Silverado Transmission Diagram - where is the transmission dip stick on a 07 impala - Where is the thermostat exactly located on a 2008 Chevy Impala & does anything have to be removed to access it? 5 Answers My husband needs to change my thermostat but is unable to locate it.. Firing order: 1-8-7-2-6-5-4-3. The firing order of the LS1/Vortec V8 has been revised from the Gen I and Gen II engines. This was done to provide more power, less crankshaft rotational stress and better emission and idle qualities.. Well, today I fixed yet another problem with my 2003 Chevy Blazer 4 Wheel Drive — Friday past, my in-dash 4×4 controls stopped working and hence I could not engage 4 wheel drive..