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Rheem classic 90 plus Summer switch?

grumc1 Member Posts: 1
It is sweltering right now and in past homes we’ve been able to turn the furnace fan on with the thermostat. This new to us home has an old style thermostat and I can not figure out where or how to manual run the fan to circulate the air in our home. I’m assuming somewhere there is a “summer switch “ inside the furnace. Can someone provide some insight on this.