Between the cylinder head the spark plug wire.
In North America, the S10 series ended in 2004.
Follow the spark plug wires, they will lead you right to them.
Need to know what size engine.
4.3? Follow the spark plug wires from the spark plugs, they will lead you right to the distributor.
Assuming this is a 4.3L engine, the engine temp sensor would be located on the side of the drivers side cylinder head, near the spark plugs.
Don't know what year you have but on a 02 S10 4.3L engine it is located on the drivers side of the engine between spark plugs #3 & #5.
If you have platinum spark plugs, 100K. If you have standard plugs, 50K.
if you are talking bout spark plugs, they are located in the side of the engine just follow the plug leads from distributer to the other end.
AC Delco
There are several reasons why a 1999 Blazer S10 may not turn over. Some reasons could be bad spark plugs, dead battery, or even a bad starter. A mechanic will be able to determine the cause.
You can begin by removing the spark plug wires from your 1985 Chevrolet S 10 Blazer spark plugs. Use a 5/8 deep well socket to turn the spark plugs out. Turning the socket to the left will loosen the spark plugs. Reverse the process to install the new spark plugs.
The 4.3 temp sending unit for the gauge is located in the drivers side head between spark plugs 3 & 5.