Help with heater core

So your heater core is bypassed? Its quite a project to replace it.

As Neuron says, it's a bit job.. Essentially, you need to remove the dashboard, so you can get to the car's HVAC components, so you can take the heater core out and replace it; Before you do that- if it is hooked to anything under the hood (and maybe yours is not?) you have to drain the coolant. To get the dash out- you'll need to remove the front seats, center console to remove the dashboard. My car had no A/C, so it was easier for me (1989 Mustang), but I hear you can get the heater core without disturbing the A/C too..

Here's a YouTube showing how to remove the heater core in an SN95 gen Mustang..
You can buy the replacement heater core (and new hoses too if you need them- you'll probably need them if it's been bypassed in your car) here:
https://lmr.com/products/Mustang-Heater-Cores-94-04

Good luck, let us know how it goes!
Jason