The condensing fan motor is located outside and under a circular grate with 5-10 screws holding it in place.
It is there to blow away hot or cold air depending on the unit such as a heat pump or air conditioner only.
Keep in mind bedsides a bad motor other things can cause a condensing fan motor not to spin including the start run capacitor or relay.
The cost to replace the motor will depend on if you do-it-yourself (DIY) or pay an HVAC company to come out and replace it for you.
If an HVAC company is paid to replace the motor or other parts it is usually $50 to $60 dollars an hour plus parts which are marked up since they bought them.
Drive time is often calculated in so if you live far away from the company gas and hourly pay is usually added on.
The average price for an HVAC company to replace a condensing fan motor is $300 to $500 dollars, of course it depends on the company.
The only way to know for sure what the cost will be is to call local HVAC companies in your area and get quotes.
If you do-it-yourself a replacement motor will run between $60 and $150 dollars, while a start run capacitor and relays are usually $20 to $30 dollars each.
For the do-it-yourself type of person replacing a condensing fan motor motor is relatively easy. Some knowledge and skills will be needed but if you have ever wired a wall socket or setup and wired in a roof fan replacing a condensing fan motor isn’t much harder.
Of course, if in doubt always call an HVAC technician.
For the DIY type of person the problem is getting the parts. Unfortunately, Home Depot, True Value or any other home supply company do not carry the parts necessary.
The parts can sometimes be bought from an HVAC company but again the prices are marked up. The good news is Amazon and eBay sell all the parts you would need.
Example Condensing Fan Motor On Amazon.
Fasco D7909 5.6-Inch Condenser Fan Motor, 1/4 HP, 208-230 Volts, 1075 RPM, 1 Speed, 1.8 Amps, Totally Enclosed, Reversible Rotation, Ball Bearing
Example Start Run Capacitor On Amazon.
GE Genteq Capacitor Dual Run Round 35/5 uf MFD 370 Volt VAC 97F9834 (replace old GE Z97F9834) 35 + 5 MFD at 370 volts
Doing it yourself of course depends on your knowledge and most often it is best to call a professional.
Ordering a part can also take time and waiting for parts on a hot day is not fun. If it is cold using a portable heater or covering up is often doable, but again depends on the person.