Check ignition switch
Resistor or blower motor power module.
If you have a 2003 Trailblazer which takes 5 minutes before it starts, there could be a problem with the remote start or the ignition switch.
If your 03 Trailblazer produces heat at the back, the problem could be attributed to a faulty blower motor resistor block.
if it doesnt work on 1 and 2 it could be a blower motor resistor but if it doesnt work at all check the fuses, relay and check voltage if it reads 12 v replace the motor
If you have no dash lights at all on your 1989 S10 Blazer, a blown bulb can be the problem. You should also check the fuse.
blower resistor especially if its chrysler/jeep or blower switch
Typically a relay or resistor. But could be a blower switch or blower motor problem.
Several problems can cause a 1999 Blazer not to start. There could be a fuel problem or a firing problem. Check for fuel pressure and ignition spark first.
Could have just overheated
In the engine compartment near the A/C evaporator box, closest to the inner fender.
If your Blazer won't go into park the problem could be with the shift linkage. There could be a problem with the cable, but the shift linkage is most likely responsible.
Check for a blown fuse.