You can read the coolant temperature in the dash. It should be between 195 - 205 when the motor has warmed up. The thermostat is a ';bear'; to get to on the 5.3 motor as it's on the right side 3/4 of the way down near the fan shroud. The 4.3 thermostat is in the normal location. AC-Delco iridium spark plugs and * AC-Delco ignition wires should go on the vehicle at no more than 75,000 miles.
If the motor is loosing power at highway speeds one of the 6 or 8 ignition coils (you didn't say which motor you had) may be at fault. Take it to a Chevrolet dealer an let them scan your on-board computer to find the real fault of your problem. Don't use off-shore box-store ignition parts on a GM product.Does anyone know how to change thermostat and sparks plugs on 04 Chevy Trailblazer?
go to autozone.com and registar your car they have an illustrated free directions for doing the job. the spark plugs dont know or care if your in reverse or park. the thermostat doesnt either but the temp cpuld be being affected by the other issue. if the engine runs fine at idle in park but stall imediately when put in gear the problem could be #1 a bad nutral safety switch, #2 a vacuum leak, #3 the tps throttle possition sensor is acting up and loosing its signal the autozone sight will give you what that code is as well. please note the code isnt a direct pointer to the problem it gives a general system that is acting up
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