Replaced cap, same but different problem...

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Old 07-03-14, 09:09 PM
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Replaced cap, same but different problem...

Usual problem, AC wasn't coming out cool. I went outside to look at the condenser and noticed the fan wasn't spinning, I pushed the fan blade and it started going on its own. So i assumed it was the capacitor. Replaced the capacitor, now sometimes the fan gets going by itself sometimes it doesn't. Ill turn the ac on and go out there and push on the fan blade again but it feels like there's resistance to it, with the power off there is no resistance at all it spins freely. If I push on it it will either get going spinning really slow, spin half way around and bind up, or sometimes get to speed and work fine. I dont understand the intermittent problem. Tapping the top of the fan motor with my hand or something heavy produces the same result as pushing the fan blade manually. Bad motor? Bad wiring? Bad cap? What should I check first, and how do I check it?
 
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Old 07-03-14, 09:34 PM
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Welcome to the forums.

Some A/C units use a combination compressor/fan capacitor and some use two different caps.
Are you sure you changed the right one ?
What was the value on the one you replaced ?
 
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Old 07-05-14, 02:23 PM
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I replaced the one I assumed was the motor cap. The larger of the two, i replaced it with the same spec cap. I will take the other cap out and test it later today.
 
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Old 07-05-14, 07:34 PM
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The larger cap is for the compressor and the smaller cap is for the fan motor.

A 3 ton unit might have a 3 horsepower compressor and a 1/6 horsepower fan motor. The compressor will require the lager cap.

Good call PJ.
 
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