Had similar issues this last weekend with our A/C. Last time this happened, it turned out to be the motor was fried. This time, noticed the problem when the house was warming up but the compressor was running. Checked and found the fan wasn't. Jumped on it before the coil iced up. Found a couple of problems that caused the fan motor to run intermittently. The furnace has a button switch that cuts ac power when you remove the access panel. Jiggling it caused the power to flicker off/on. Appears to be bad contacts. Jumpered the switch temporarily. This improved the situation. But also found that opening the door on the programmable thermostat or pressing buttons would cause the fan to flicker off/on. Suspect to be poor contact on the "FAN" signal in the thermostat. Disassembly & repair (if possible) of the thermostat is next step. Otherwise, replacement.
Just wanted to point out that there can be a couple of other things that cause the fan to run intermittently, which reduces air flow and promotes icing. Also, put your hand on the A/C lines running into your furnace. Should be noticable difference (hot/cold) between the 2 lines.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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