Furnace Not Blowing Hard
Measure the diameter of the pulley on the motor. Should be at least 3.75" or perhaps a 4". You need to increase its size from the basic 3.25" to overcome the resistance of the new AC coil. That furnace is a fuel guzzler and a new one would pay for it self quickly. You may need new bearings when the fan is speeded up. At 28 or more years old and with that rusty shaft it may need a new blower wheel and be difficult to take apart and expensive to repair. You should have at least a 1/3 hp and possibly a 1/2 hp motor to be able to use larger pulleys and speed it up.
"Cut it twice and it is still too short".
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Last edited by yuri; 08-19-2010 at 08:52 PM.