with your hands
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.
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.
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The heater core in a 1994 Mazda MPV is under the dash on the passenger side. The dash has to be taken apart to change out the heater core.
How do you change a heater core in 1994 chevy astro van?
you have to remove the dash
Unfortunately, there is no "easy" way to change the heater core. The entire dash board has to come out. then it's easy. Then you have to put the dash back in. Sorry :(
heater core leak
http://www.coloradok5.com/heatercore.shtml Check this out its a very helpful writeup