If the PCM isn't returning signal, even with a functional fuse and a clean 12v signal from the battery (If you are unsure of the battery's health, perhaps a new one is in order as well. the PCM requires a clean, dedicated signal, and an older/corroded battery can cause a weakening or interruption of the PCM 12v signal), It is possible the computer has been accidentally flashed over. A good next step would be to remove the PCM from the vehicle and bring it to your local GM dealer, preferably a GMC/Chevrolet (since they'll have the most knowledge of the workings of the 4.3 Vortec motors and electronics) dealer with a Tech II scan gauge. They will be able to tell you if there is an issue with the PCM.
check emc fuse and the fuse next to it
use a cutting torch
Check for a blown fuse.
You can use any type of SAE certified transmission fluid in your 1997 Chevrolet Blazer. You can check the transmission fluid level with the transmission fluid dipstick.
why is my 1997 chev blazer over heating
1995-1997
You lift the hood and look at the pressure gauge.
how many mpg does a 1997 chevy blazer get?
your heater core is going out, you need to replace it before it ruptures.
how to replace a heater core in a 1997 Chevy blazer
no
Will a 1997 blazer what work on a 1999 blazer????? If your talking engine, transmission, or running gear than yes. It is all the same.