My ac blows cooled air but my heater does not get

the heater coil has possibly burnt out. This coil is located behing the evaporator coil in the window a/c. To access the coil you need to pull out the unit from the casing. The coil looks like a toaster coil and is possibly in a metal box. Several screws hold the coil in place. If you are doing the repair yourself you will need to remove the coil take the model and serial number with you to an appliance parts house for replacement. Removal of the coil like i said before isn't hard however, you need to make sure all of the electrical wiring you diconnedct has been marked to insure you are placing the correct wires back in the correct location on your new heater coil. Good Luck on your repairs hope this helped you some

Dave