How do you change heater core 1984 montecarlo?

Answer 1

If my memory is correct, everything can be changed from under the hood. The heater box should be on the passenger side by the firewall. Remove all of the screws that hold the top of the box on. Be very careful when removing the top of the box. The sealant is insanely strong and you can crack the box, if you pry or pull too hard. Once the top it off it should be right there. Disconnect the heater hoses and lift the heater core up and out. Make sure to check the new heater core for leaks before installing it. This is easy, cork both tubes off and dunk it in a bucket of water. If you see bubbles, take it back because it is leaking. When reassembling the heater air box make sure you apply a liberal amount of sealant. This will prevent leaks.

Answer 2

If you are looking to bypass the heater core you can go under the car. Look for the firewall that is located in the dead center.