It is summertime so there is no demand for heat. The temperature is cool s0 there is no demand for cooling. The blower on my furnace is cycling on and off. I turned off the thermostat and this had no effect. Still cycles. I disconnected the green wire from the thermostat to the furnace to eliminate a thermostat problem. The blower still cycles on and off. If I turn the main power off to the furnace and leave it off a few hours and then turn it back on the blower may not cycle again for 1/2 a day or a day but will eventually cycle. There does not seem to be any pattern to the cycling. Any ideas on what to may be the problem and what to check?