I know youre trying to keep it a little low budget - but why bother keeping on fixing something so old ? I am sure a more efficient one would save you money on your bill and there may be some incentives with the power company.
I held out for a long time on my unit from the 60's .. but when it finally gave out, I decided to replace it with a brand new one and I saw a huge drop on my bills.
See this line; it seems like a new HVAC is already in the works but I'm guessing that it takes a while to build up the scratch so spending $125 now is better than the alternative (sweltering house)
I'm going to replace the entire system here in about a month or so, but I'm not sure if I want to have my family deal with the summer heat while I'm at work until we do get that whole new HVAC system or should I find a similar enough motor motor unit and replace it.
Please note that I know NOTHING about HVAC systems but a little something about wiring diagrams. You can see if on the left side of the label you posted and its consistent with these notes.
Brn — goes to Capaciter
White - goes to the other side of the capaciter and then to Line
Black - Line
Three more wires for speed:
Black - High Speed
Blue - Med High
Yellow - Med Low
Red - Low
Capaciter is 12.5mFd @ 370V
If you replaced the burnt out motor with another one of slightly different spec, example, THIS ONE:
Furnace Blower Motor 5KCP39PG | eBay
Just match the wiring (looks the same at first glance but it's your house so double check)
AND replace the capacitor with the one specified by the new motor.
For example, this one calls for a 10mFd @ 370V cap
The one thing I cannot help you with is I dont know if you can sub the existing 12.5mFD cap for this one.
Q: Do you know who might be able to answer that question?
A: A guy like Hoarder158 to sells used HVAC parts on Ebay.
Just to be safe though a new cap is only $8.25 so in your shoes, I'd just buy a new cap and call it a day. I don't know how tight money is for you though but I can imagine not having AC when temps climb into the 90s can make your house uninhabitable.
Run Capacitor 10 MFD 370V Round AC Electric Motor HVAC 370 Vac V Volts 10 Uf | eBay
PS. Engr school was 16 years ago for me and I've never worked on an AC system in my life.