Open both front doors and remove everything from the front seat to the firewall, no kidding. If you intend on doing this job, purchase a shop manual for the vehicle, you will need it.
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.
Drain the water from your 1994 Chevrolet Blazer cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
drop the steering column, remove entire dashboard.
I have a 1999 blazer. The heater core clogs up about once a year from the Dexcool. Try having it (heater core) flushed and use Prestone (Extended life) instead of Texaco.
You will need to remove the water lines from your heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
how do i replace a heater core in a 2001 Chevrolet blazer
how to replace a heater core in a 1997 Chevy blazer
The 1999 Chevrolet Z 71 heater core can be accessed by removing the passenger side kick panel. Remove the heater core water hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
To change the heater core on a 1999 Chevy 4-wheel drive, first remove the dashboard and drain the coolant. Unbolt the core from its mounts and remove the dash panel to be able to change the heater core.
To replace the heater core in a 1999 Opel Astra, remove the center console and remove the 6 5.5 mm bolts. Also remove the clips and remove the cover and plastic clips on each pipe. Finally, lift the heater core and replace with new.
Underneath the dash on the passenger side. Open the hood and you will see the hoses entering the firewall where the core is located.