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Old 06-14-2015, 09:06 AM   #1
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1969 31' Sovereign
Auburn , Washington
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Armstrong AC fan quits!

I have a 1969 31 foot sovereign. When I turn on the AC it blows cold and strong. As it runs for a couple of minutes the fan seems to slow down then eventually just stops while the compressor just happily hums away. You need to wait for awhile to get the fan to come back on. Any suggestions?
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Old 06-14-2015, 09:21 AM   #2
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On my 88 model with the original air conditioner the fan motor is outside under the shroud. I think you should get up there and check the bearings for lubrication and the wiring for corrosion. Mine failed because the hub for the outside fan corroded and failed and let the fan hit the housing. I ended up replacing the whole unit because of the fan and shaft condition even though the compressor was fine. You might have more incentive to just replace the fan motor or whatever you find that is causing the fan to stop.
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Old 06-14-2015, 11:28 AM   #3
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Quote:
Originally Posted by Bill M. View Post
On my 88 model with the original air conditioner the fan motor is outside under the shroud. I think you should get up there and check the bearings for lubrication and the wiring for corrosion. Mine failed because the hub for the outside fan corroded and failed and let the fan hit the housing. I ended up replacing the whole unit because of the fan and shaft condition even though the compressor was fine. You might have more incentive to just replace the fan motor or whatever you find that is causing the fan to stop.

Yeah the unit is in such good shape I can't just get rid of it I was thinking just replace the fan motor your right it's probably bearings or worn insulation on the armature. I am nervous to find a way on the roof. Any suggestions on how to get up there.
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Old 06-14-2015, 12:12 PM   #4
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On our Armstrong, the fiber washer at the base of the motor had worn down, allowing the rotor to drop slightly to the point it bound against the armature in the housing. My solution was to take the fan motor apart, and install a new washer. It worked for some time after.
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Old 06-15-2015, 11:54 AM   #5
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I had the exact same problem with my first Airstream a 1972 30' with Armstrong A/C. After a summer of changing moters, condensers, I found the problem; a 5 cent wire nut that would not tighten. Replaced it, worked for years after. Very cold a ggod unit.
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Old 06-15-2015, 12:08 PM   #6
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Where was the wire nut located
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Old 06-15-2015, 12:12 PM   #7
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AC fan motor bushing

I had the same problem on my 73 Argosy fan motor. It would run for a while and then stop. Turned out to be one of the bushings on the motor shaft was very worn. Replaced the bushing and all is well.
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Old 06-15-2015, 02:16 PM   #8
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Triflow bike chain lube at shaft/motor housing should give it the drink it needs. Or even a drop or two of high quality machine oil. Your in the N/W so I assume you dont know what cooler oil is but that the stuff. NOT 3way or WD40! If there's no side play it just really wants a sip of the good stuff!
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Old 06-15-2015, 02:51 PM   #9
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The weird thing is I take the air filter off and spin the fan by hand and it spins really well.
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Old 06-15-2015, 02:54 PM   #10
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Quote:
Originally Posted by alantbird View Post
Triflow bike chain lube at shaft/motor housing should give it the drink it needs. Or even a drop or two of high quality machine oil. Your in the N/W so I assume you dont know what cooler oil is but that the stuff. NOT 3way or WD40! If there's no side play it just really wants a sip of the good stuff!

I will try some marvel mystery oil that's what we use at work when we rebuild motors, but like I say it spins by hand really well.
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Old 06-16-2015, 09:14 AM   #11
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Armstrong acc

The main electric feed. The compressor

Would continue to run after the fan stopped. Good luck
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Old 06-16-2015, 09:36 AM   #12
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Yes compressor runs after fan stops
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Old 06-29-2015, 01:43 PM   #13
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it's a 40 year old window air conditioner that drafts downward .
maybe it's time to step up and buy a new 1 ?
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Old 07-01-2015, 09:53 PM   #14
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1969 31' Sovereign
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it's a 40 year old window air conditioner that drafts downward .
maybe it's time to step up and buy a new 1 ?

These "40 year old window AC units are built tough and parts are available today to repair them. They are not throw away junk like they have today. Anyhow I fixed it seems I had the thermostat wired wrong now blows ice cold continuously.
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