97 gtp heating issues

[CHAMPS97]

hey fellas my car gets luke warm heat,rear window won't defrost even though the light goes on when you push the button on the climate control.also the blower fan runs constant, i had to hook it up to a toggle to stop killing batteries.for about a week my car was overheating so i changed the t-stat with a fail safe one it overheated some more, now it barely reads more than a120. i'm lost any help appreciated thanks

[Fivefingerdeathpunch]

bleed the air out of the system and see if that helps.

on top of the T-stat housing a nut/screw and open that about 2-3 turns, and run the car for a while and let it heat up.

then watch as the air bubbles come out and once its just straight coolant coming out, close the nut.