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Old 02-26-2014, 12:54 AM   #15
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getting close

I bought a new fan capacitor and installed it today. Now the A/C blows great on med. and hi but the fan doesn't come up to speed on low. This is really O.K. I remember that when it went out last summer I didn't immediately shut it off as I probably should have, so I may have cooked the switch or something.
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Old 02-26-2014, 01:35 PM   #16
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I could be wrong (it has happened many times before ) but I seem to remember that there is a "start" and a "run" cap in there.

Clearly you have replaced one of them; do you see a second one? In this case, the 'start' cap, I believe...
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Old 02-26-2014, 01:46 PM   #17
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I bought a new fan capacitor and installed it today. Now the A/C blows great on med. and hi but the fan doesn't come up to speed on low. This is really O.K. I remember that when it went out last summer I didn't immediately shut it off as I probably should have, so I may have cooked the switch or something.
Your AC is 38 years old.

Guess and guess and guess won't fix it.

Replacing ALL the capacitors is the "only" way to go.

Then you can kick back and relax for another couple of decades.

Piece mealing is never the way to repair anything, because you only ask for more problems.

Repair it correctly and be done with it.

Andy
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Old 02-26-2014, 02:41 PM   #18
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The hottest day of last summer I was running my air conditioner all day full blast when suddenly it started to run real slow and just drizzle cool air. Not wanting to call some repairman to tromp around on my Tradewind's roof, I bought a used window unit for $70 and decided to fix it myself when the weather cooled off.
Fast forward to cool weather (2/21/2014) and I climb gently up top to see what I can do. Removing the cover to expose the condenser, fan, and wiring took a screwdriver on the four screws. To test the unit I turned it on and noticed the fan was turning, just very slowly.
That's where I am now. Does anyone remember having a similar problem? Before I go further I thought I'd check Airforums to see if I can get an opinion or two.
Just a thought. When I bought my 1076 Sovereign back in 2000 it still had the orginal Armstrong AC. It would run but very little air came ot of the vent. I pulled the cover on top and cleaned everything but still very little air flow. I looked over the squirrel cage blower and discovered that there is a small allen screw that hold the blower to the motor shaft and it has loosened over time so the blower just rotated on the shaft . I tightened the allen screw and had full air flow.
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Old 02-26-2014, 04:27 PM   #19
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Just a thought. When I bought my 1076 Sovereign back in 2000 it still had the orginal Armstrong AC. It would run but very little air came ot of the vent.
Wow.

938 years old and still running
.

Andy
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Old 02-26-2014, 08:52 PM   #20
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Really Andy?
When you have a light burn out in your coach. Do you replace all of the lights?
I don't think so.
Like a light bulb, a capacitor works until it fails.
Since the other 2 are obviously old. I would carry spares. Depending on how important A/C is to me.
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Old 02-26-2014, 09:48 PM   #21
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terrencecolp,
If you ran the motor with a bad start cap for any length of time you probably burned one of the windings, meaning you really have a two speed motor now. Only way to fix that is replace the motor, or learn to live with it. Might have lost a little speed on med and high but it shouldn't hurt anything. When I did A/C repair many times we replaced 2 speed motors with three speed and just capped one wire off.
TomJ
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Old 02-27-2014, 03:55 AM   #22
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My 1975 Armstrong A/C has 3 capacitors, 2 for the condenser(start and run) and the one run capacitor that I replaced for the fan. It was over 100 degrees when it went bad, so like a fool I continued to let it dribble cool air for about 10 minutes until it stopped almost completely. After letting it sit off for an hour, I tried to start it and the condenser came on and the fan RAN very slowly. I like the thought that I may have burned the slow run windings in the motor. I now at least have med. and hi.
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Old 02-27-2014, 10:08 AM   #23
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Really Andy?
When you have a light burn out in your coach. Do you replace all of the lights?
I don't think so.
Like a light bulb, a capacitor works until it fails.
Since the other 2 are obviously old. I would carry spares. Depending on how important A/C is to me.
I agree that a capacitor and/or condenser works until it fails.

My suggestion was to replace all the cheap stuff and be done with it.

Bulbs have a life time. We have many customers that indeed do replace all the bulbs in a fixture at one time.

Some do, some don't.

As always, a personal choice.

And, so it is.

Andy
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Old 02-27-2014, 12:27 PM   #24
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When you have a light burn out in your coach. Do you replace all of the lights?
Yep, I replaced almost all of them with fluorescent fixtures and LEDs. The few remaining that are incandescent bulbs I replace on a scheduled basis so I'm not inconvenienced when traveling
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Old 02-27-2014, 06:54 PM   #25
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Take it to the limits

If any of you want to see how far the original Armstrong roof AC unit can be taken, read member jmpratt's project. Not only did he rebuild it, but he improved the power output of his unit and added the 'heat pump' feature!

http://www.airforums.com/forums/f427...dor-76432.html

You may not need to go as far as he did, but read it to see some of the unique parts of the Armstrong's design.

ps: he is still active here on the Forums, if you have any questions...
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Old 02-27-2014, 09:12 PM   #26
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I think that if I had to climb up on top of my Airstream and remove the cover to replace a capacitor, I would for sure consider changing them all, especially since I don't carry a ladder with me when I travel.

Heck, even when having to get a ladder to Change a bulb in my ceiling fan, I change all four at one time. My time, labor, comfort, safety, and even my convenience have value.
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