Blows air just fine--the air is not hot though-just feels like the vent--AC works fine. HELP!!

Welcome to AF !

It would help to post your make, model, trans,
on what car you are asking about.

Tho thiers a few things, the heatercore is plugged.
Thermostat is stuck open , or no thermostat,
not allowing the motor to get hot for the heat.

or the control mechanism in the dash is not turning the flap from ac to heat.