I would suggest purchasing a shop manual for that vehicle to do that job.
You have to completely remove the dash to get access to the heater core.
You have to remove the entire dash board to gain access to the heater core.
Under dash, drivers side.
No. just remove the plastic piece around the radio. It pops off.
the temperature control actuator is on top of the heater box under the dash. you have to remove the dash to get at it. a repair manuual will show what screws to remove
Are you sure you didn't turn the dimmer down
take old one out, insert new one in after you remove the dash cluster.
You will need to remove the dash assembly to gain access to the blend door actuator. Recomend purchasing a shop manual of you intend on doing that job.
When parts of a car do not work, it is important to know where its fuse is located. The horn fuse in a 1999 Chevy Blazer is located in the fuse box under the driver side dash.
You have to remove the entire dash assembly.
It is located on the HVAC box behind the dash. Unfortunately the dash assembly has to be removed to gain access to it.
its under the drivers side of the dash you may have to remove a plastic kick panel just below the dash