Changed stereo, now no heat???

[the5conks]

I put in aftermarket stereo in my 2002 Explorer 4.6. Now, the heat does not work, just blows cold. I recently replaced the blend door, and there is no clicking, just no heat. I pulled the dash face off again, checked the connection to the heat dial, and everything looks good. Even the rear defrost light lights from the same connection. Does anyone have an idea what may have caused this?

 

[BrooklynBay]

Check the fuses.

 

[the5conks]

Fuses look good...

 

[mountaineer2004]

Stop playing "Cold As Ice" on your new stereo, and start playing "The Heat Is On". It may not solve the problem entirely, but it'll help