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One, is there any air at all coming through the top vent? If not schedule a professional service call with a local reputable company. You may have a blockage. If there is air coming through and it is cool, try letting the fireplace warm up for about 15 minutes before trying to run the fan. The fan can only blow hot air after the fireplace gets hot.
What is the cooling problem? Have you checked the fan after holding in the light / fan switch. Some fans go off when the door is open. Fan is probably stuck due to lack of lubrication. Check fan to see if it spins freely. UNPLUG UNIT BEFORE EXPOSING WIRES, be sure you are clear before plugging in while doing test runs etc.
Check for a frozen cooling coil. Turn the fan to the on position at the thermostat and the cooling to off. Your cooling coil may be iced over. Allow it to run in the fan only mode until the coil has had a chance to defrost. At the outside unit you may see the large line is frosted. This is the visual indication for a frozen coil. When you return the A/C to cooling use it with the fan on while in the cooling mode.