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Hi, how are you? The elements shouldn't actually be glowing if airflow is correct across them. If they are bad, then they would not have a circuit in them. For example, you can find the start of one element where it wires to the furnace at the ceramic connector and place one lead of an ohm meter there. Then the other lead on the opposing side, not the one beneath it, and see what it ohms out at. If you have more than one element, then they will be typically stacked on top of each other, but you can check each string the same way. Make sure high voltage is disconnected. Also, there are limit switches. If you recently had a blower changed, I would think maybe you have a defective limit or fusible link. If you follow the high voltage from each side of each individual element one of the sides is going to go through the limit. There will be one limit per string. So, if your tech ohmed them with his meter before the limit he may have actually found the limit open and not the heater itself. Also, you can unwire the high voltage wires and pull them out of the furnace and physically inspect the electric heaters for breakage in the wire itself. If you need any further assistance please feel free to follow up. Thanks.
Alright thanks. Let me know if you need more information.