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If you have a switch that can manually turn on the fan, try it to verify the fan works. This is what I think is happening. The normal operation should be thermostat calls for heat, inducer fan comes on, pressure switch closes, igniter glows, main burner ignites and then in 30 or so seconds the fan comes on and stays on until the thermostat is satisfied. Once the thermostat is satisfied the burner shuts off and the fan runs for approx 120 seconds then shuts off. I think the control board that automatically turns your fan on is faulty. On most modern furnaces if the auto fan control fails and the furnace gets to hot and limits, when the limit opens and shuts off the burner it also energizes the fan motor to cool the heat exchanger.
There are two fan switches on that car; The main one turns the fan on and off when the ignition is on and the car is running. The second switch powers the fan if the ignition is off and the engine temperature is too high, to cool the engine off if it was just shut down. It sounds like your main fan switch has gone bad and needs to be replaced since it's not sending any signal to the fan, while the engine is running.
some switches are normally closed "short position" press switch "open" it will be labeled NC on the one side, "stands for normally closed" and others will be NO "stands for normally open" press switch "short" if there is no change in readings when you press switch it is defective.
I believe these models have a thermal switch on or near the heating element that normally runs the fan until the element has cooled. Similar to your home furnace. If the fan never shuts off this switch is likely bad. IF it takes a long time to shut off then it may be out of calibration. In either case they are non repairable parts and have to be replaced. If the heater is in a high spot resulting in a high ambient temperature it may take a while for the fan to shut down.
Try hook up the rad fan wires to the wires that power the headlights so that when the vehicle is running the fan would come on, or even try a toggle switch. If this aint working take the car in to the mechanic. hope I could have been some assistance. Charles H
Did you check the switch next to the interior light on the roof? Honda's have a switch position that turns off the dome light completely, so it won't work when the doors are opened or not shut tightly. There are 3 positions, dome light on all the time, dome light on only when door is opened, or ajar, and dome light off. I must say, I love Honda's, but I find this switch annoying!
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