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My name is Billy.
Can you tell me what the terminals are labeled that you have the blower wires attached to?
Some say HI and LO
Others COOL, HEAT
PARK...M1 M2....what are yours labeled?
thank you...and what function are you wanting to speed up fan for?..heat or cool?
Ok, you are currently wired for as high a speed as possible on cooling.
If the motor shows no signs of increased speed, then you likely have a worn motor...is the motor original?
If you go to the ac coil where the freon pipes enter...is there any frost or ice present on the larger insulated pipe?
the ac coil on the furnace
Ok, well we have 2 choices...
lack of air flow
lack of refrigerant
the cool terminal has the highest speed wire currently. If only 3 years old I would assume motor is ok.
Have you tried with the filter out? Some of the newer filters are too dense for older systems
Unfortunately refrigerant levels can change year to year with the expansion ans contraction of fittings....I do not mean fluctuate by increasing amount..but a unit fine for years can develop a leak at any time no different than a tire.
When you have little cooling, like yours it boils down to a missing factor....that is proper air flow and proper refrigerant level.
It sounds by your description that the blower is slow. This means filter is too dense, ac coil on furnace is dirty, blower fins dirty, or something else hindering air flow.
The bad thing is it does not matter how new a motor is..or what refrigerant was last year...both of those items can change at any time.
if you go to the 2 pipes that carry freon...and feel them both while ac is running...tell me if they are cool, warm, wet dry etc,,
Only one line should be cold....
I would check the coil for dog hair (which I know alot about)...and if that is clear then I would call for a refrigerant check up..
I wish you the best!
You are very welcome :)
Have a great weekend