If "coil fan" refers to the indoor blower, check for the following:
1. Thermostat Fan switch set to ON position.
2. Fan relay contacts stuck (due to arcing and/or corrosion).
The HVAC Veteran
that depends on what is wrong have you checked the compressor?
does the fan work? is the system charged with the refrigerant?
Most likely, it is a stuck contactor or relay that controls the compressor motor. If the compressor continues to run after the blower inside the house has shut off, the only way to stop it is to kill the power, either at a dedicated switch or sub-panel for the air conditioning, or at your main breaker panel. Turn off the power to the air conditioning and furnace system until you can have the unit serviced.
question is too vague
Its broken.
1991 mitsubishi eclipse 2.0L starts 2 to 3 seconds later shuts off
The refrigerant level is probably low. When the compressor turns on it pulls refrigerant from the low side and as soon as the low side pressure drops below a certain point, the sensor disengages the AC clutch. If you haven't already converted your AC to 134A, now would be a good time. All vehicle AC compressors leak a little refrigerant, simply because of the design of the system. The system may not have any serious problems even though it has lost a little pressure.
Generally, because something is wrong with it. Maybe a bearing went out, maybe the compressor is just worn, maybe it was damaged because of a refrigerant overcharge, compressor oil overcharge, or the wrong type of compressor oil used. Could be a number of reasons.
souns like a misfiring.
what's it doing?
check for bad crank sensor!!
IDK yup