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I have had luck over the years with unplugging the TCCM for about 5 minutes and plugging it back in for a reset if this doesn't work and all your fuses are ok I have also had the motor and circuit board on the side of the transfer case short out and cause this problem.
If you live in a state with smog license requirements your wasting your time, the engine has to meet EPA requirements for the year vehicle was manufactured your car is considered a clunker good luck getting it smogged. And it is no big deal to change. 350 is almost identical to 4.3 just some variations.
follow the upper radiator hose to the engine, under the nipple that the hose attaches to on the engine is the thermostat, 2 bolts and maybe a bracket VERY EASY TO DO.
I'm no expert but you might replace either the motor or the actuator... i'd replace the actuator first though because i have heard of this problem alot with electronic transfer cases on the blazer series... and it might not be too bad of an idea to check the fluid in the transfer case.. i too have a 1994 s10 Blazer but i have yet to have an issue with the 4-wheel drive
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