Although I replaced the heater coil the root cause was the sensor on evaporator return copper tube. I ordered both parts and choose to test the heater coil first. To rest heater coil I had to remove coil in order to access connectors at each end to measure resistance. Due to the level of difficulty in removing coil,I choose to replace coil while I had it out. The sensor is a much easier repair.
The online Videos would have been nice before I purchased parts. One of the videos (heater coil replacement) didn't represent the model I had but was general enough for me to understand the procedure.