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Replace AC condensor fan as preventive maintenance? #5463755 06/26/20 11:24 PM
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motor_oil_madman Offline OP
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Anyone replace their outside condenser fan as preventative maintenance on their house HVAC system? I think a lot of older systems don't have any kind of fail safe, so I imo if the fan fans outside, then the unit is going to keep running until the head pressure goes insanely high and probably starts leaking out. I believe my dad just replaced the whole system once shortly after he had someone put a new fan in. I guess it had problems after that.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463776 06/27/20 12:42 AM
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PowerSurge Offline
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Unless it’s not running correctly, I’d leave it. Condenser fan motors have been known to run 20-30 years or more. I do check the capacitor every spring.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra 5.7L
Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463793 06/27/20 02:26 AM
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I keep a spare capacitor on hand, but other than that, no. If the compressor is running with no fan it should slam right into the thermal cutout to save itself. Probably not the best thing for it, but it shouldn't burn up.


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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463808 06/27/20 03:04 AM
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Skippy722 Online Happy
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Nope. When it starts making abnormal noise then I’ll replace it. But man, that York unit is almost silent!


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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463817 06/27/20 04:08 AM
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Ridiculous. sailing


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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463822 06/27/20 04:28 AM
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Lubener Offline
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Originally Posted by motor_oil_madman
Anyone replace their outside condenser fan as preventative maintenance on their house HVAC system? I think a lot of older systems don't have any kind of fail safe, so I imo if the fan fans outside, then the unit is going to keep running until the head pressure goes insanely high and probably starts leaking out. I believe my dad just replaced the whole system once shortly after he had someone put a new fan in. I guess it had problems after that.

The motor's current draw will determine its condition. They last a loooong time. The only item I have changed as PM when my outside unit hit the ten year old mark was the multi section capacitor. For roughly $89 you could have a qualified person pay you a visit and perform a P.M. on your system.

Last edited by Lubener; 06/27/20 04:30 AM.

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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463844 06/27/20 05:47 AM
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Amkeer Offline
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10-15 years is when the whole system should be replaced.


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Re: Replace AC condensor fan as preventive maintenance? [Re: Amkeer] #5463873 06/27/20 06:47 AM
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PowerSurge Offline
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Originally Posted by Amkeer
10-15 years is when the whole system should be replaced.


Negative. If a system has been reliable, run it until it dies unless you just want to upgrade and have money to burn or you have an R-22 leaker. The power savings going from say a 10 SEER to a 14 isn’t as great as a lot of companies promise.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra 5.7L
Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5463929 06/27/20 08:06 AM
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irad Offline
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I have oiled the condenser fan. The unit stopped turning and was hard to turn manually. I oiled it and spun it by hand until it kept spinning when turned by hand with the power off. It has been at least 5 years ago. My daughter has since sold that house but I assume it is still running. So non detergent oil either through an oil port or directly where the shaft meets the motor body. You could open up the motor and clean and grease/oil the bearings.

Re: Replace AC condensor fan as preventive maintenance? [Re: Amkeer] #5463970 06/27/20 09:01 AM
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Lubener Offline
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Originally Posted by Amkeer
10-15 years is when the whole system should be replaced.

Nope. Mine is running like a champ at 20 years. A sales person might say something like that. At 13 Seer, cannot justify replacing a working system just because it is old. You won't realize a ROI for many years.

Last edited by Lubener; 06/27/20 09:04 AM.

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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5464099 06/27/20 12:23 PM
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I had the a.c. guy out a last month and he said the motor was leaking. Isnt it just a sealed bearing with grease? He also said he's seen them leak for years and be fine. The voltages and pressures looked fine when he hooked up to the condenser unit.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Replace AC condensor fan as preventive maintenance? [Re: Lubener] #5464106 06/27/20 12:29 PM
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Originally Posted by Lubener
Originally Posted by Amkeer
10-15 years is when the whole system should be replaced.

Nope. Mine is running like a champ at 20 years. A sales person might say something like that. At 13 Seer, cannot justify replacing a working system just because it is old. You won't realize a ROI for many years.


Yeah they consider the newer units to be old and due for replacement after only like 12 or 13 years now, so I prefer the old one just stay running. The electric bill during the summer is only like 80 bucks.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5464156 06/27/20 01:28 PM
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Fan replacement no, if it's that far gone that you need to change the fan, then change out the whole unit. Otherwise, lubricate the shaft seasonally, or spring/fall if running a heat pump, since it will run year round. As long as an electrical check-up tests fine, lube the fan and forget it.

The last condensor problem I had was the capacitors gave out. Cheap fix.


'03 Suburban
Re: Replace AC condensor fan as preventive maintenance? [Re: PowerSurge] #5464312 06/27/20 04:49 PM
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Originally Posted by PowerSurge
Originally Posted by Amkeer
10-15 years is when the whole system should be replaced.


Negative. If a system has been reliable, run it until it dies unless you just want to upgrade and have money to burn or you have an R-22 leaker. The power savings going from say a 10 SEER to a 14 isn’t as great as a lot of companies promise.


I'm with you....I have R22 and so far it still cools so I pray each and every June!!!!!!!! Where I'm at I need it June July August and a week or so into September.


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Re: Replace AC condensor fan as preventive maintenance? [Re: motor_oil_madman] #5464322 06/27/20 04:59 PM
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My r22 system is getting old, 4 ton unit.
16 years on the compressor, the attic coil is 24 years old.

Last edited by spasm3; 06/27/20 05:03 PM.

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