The orifice is clear of blockages and is stamped .082 so the furnace must have been converted. Yes, the fan switch opens each time the blower comes on and closes each time it cycles off, even after installing a brand new switch.

I have a Coleman Evcon Model: DGAT056BDC. The blower cycles on and off frequently during operation while the burner remains lit. I have replaced the fan limit switch several times to no avail. When the thermostat calls for heat, the burner ignites, heats the chamber, then the blower comes on. After ...