How do you replace a heater motor in a 2003 Mitsubishi eclipse?

Answer 1

Alright, I just did it myself... I even have some pictures if you need it. I will try to make this brief. Are you talking about the 4 banger or the V6? Here is the one for the V6:

Remove intake manifold for better visibility.

Disconnect two medium size hoses directly behind the engine and almost in the middle of the firewall. Directly adjacent to the wiring harness entering the vehicle through the firewall.

Loosen, but do not remove, the main screw in between the two hoses holding the Evap/Heater box to the firewall.

Now here comes the hard part -- Remove your dashboard... that's right... the WHOLE thing. There is no other way to accomplish this without it.

When you remove the dash, you will see the box directly behind the glove box.

Remove the main screw carefully while making sure not to break the small alignment plastic piece on the interior of the car.

Remove the box from the car and you will see two hoses coming out of the box that lead back to your heater core.

Disconnect the metal hoses and slide out the heater core.

Now here's the weird part... I doubt your heater core is actually bad. I recently opened mine up to find that my heater core was fine but a small electrical control box that operates a lever wasn't. The gearing froze inside of it and now will not operate a valve that allows coolant to flow through the heater core. Also, as you will find out... nobody sells your particular heater core.