If the hoses on the the heater core are getting warm Chances are you have a compacted heater core, provided the fan is working at all settings. Pull the heater core and clean it and the housing of debris. Then chase the debris as far as you can. If you pull the fan you'll see.
"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
"Just Jeepin it real"