Ok dose this model furnace have a circuit board? if so there should be markings on the board where the blower leads are attached. such as cool heat park/or un used motor leads. and to speed up your blower it is going to be either the red wire or black wire they some times alternate you will have to see how the blower sounds or feels.. but you are going to replace the wire going to the heat terminal with a red or black wire and see how that works for ya. just makesure the power is off before sticking your fingers in there... also it may seem too obvious but ill say it anyway check ait filter and make sure all your dampers are open properly on the supply duct work
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You may want to check on the vents for it can be closed half way. If the vents are good then the problem will surely be on the blower itself. It can be worn out that's why the blower motor blows weak. Once replaced I believe you'll be good.
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Replace the blower motor resister,this is the speeds for the blower motor,it is located very near the blower motor,and is mounted on the blower box,and it actually goes inside the box,to keep it cool.The reason for it`s failure is the blower motor,even though the blower motor sounds,and runs good,it is drawing too many amps.If this was at all helpful,please rate,thank you.
Check the blower motor speed control resistor pack is ok.
(The resistor pack is usually located in the blower fan ducting in the air flow).
Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen.
Check operation/replace any blower motor control relay,
Check the blower motor will run if +12v directly applied to the blower motor.
Check operation of the blower motor speed control switch is ok.
The indoor blower motor is sometimes a 3 speed motor.The heat usually works on low or medium speed.But the a/c is usually on high speed,this gives greater air flow across the evaporator coil to give you better cooling,also better air flow at ducts.These speeds are usually wired through a relay in the inside unit (air handler).They can be changed.If you go to thermostat and put the fan switch to "on" the blower should operate on "high" speed.With the fan switch set to "auto"the operation will determine the fan speed.Hope this helps. Gregg