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Old 05-11-2010, 09:52 PM   #15
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1993 21' Sovereign
Colfax , North Carolina
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Help a dummy out. Is the filter located in the upper shroud? Should you clean or replace the filter?
Thanks
The only filter is inside the trailer, inside the interior a/c cover. You can clean them, unless they are badly degraded. If they are degraded, you can get the filter material from many Airstream dealers, or even home improvement stores. You will need to cut it to fit.
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Old 05-11-2010, 09:59 PM   #16
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Help a dummy out. If I want to clean the coils, do I need to remove the upper part of the shroud? If so, do I still need to remove the 4 bolts? What is the best way to clean the coils? Is the filter located in the upper shroud? Should you clean or replace the filter?
Thanks
The shroud is in 2 pieces.

To work on the AC, you must remove the "complete" shroud.

Then you can easily remove the AC top cover.

Andy
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Old 05-12-2010, 12:20 AM   #17
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A drop of hydrochloric (muriatic) or nitric acid on a screw rusted fast in aluminum and left to sit for a while really works; this can/should be repeated several times before attempting to loosen the screw. Slightly warming the metal w/ a heat gun will speed things up; watch out for fumes. This is a normal way of removing broken taps/drills from aluminum parts...

- Bart
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Old 05-12-2010, 03:06 PM   #18
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1978 28' Ambassador
Savannah , Georgia
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Well bless your little heart Bart. Have tried everything else, but did not know about muriatic acid on the head of screws. Want to leave work so I can go try it. Regarding shroud, finally got mine removed in one piece. It was vulkemed to the roof. Plan to epoxy resin the cracks in the old shroud and paint. AC still works after 32 years! Did remove AC inside cover, removed rust, painted and replaced insulation with foil insulation. Looks good. Where is my muriatic acid? Thanks. Jack
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Old 05-12-2010, 03:55 PM   #19
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1980 31' Excella II
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The only filter I know about is located inside the trailer on either side of the plastic housing for the airconditioner. On mine they are located on the sides and the outlets are on the front and back. The filter if you want to call it that is made up of thin expanded foam sheets that fit the openings. If they are at old they will crumble to dust when you try to remove them or wash them out. The foam filter material can be purchased at rv stores in small rolls that can be to be trimmed to fit with scissors. You have to pop the plastic grille off each side and then remove the foam. I took the whole bottom plastic shroud off (it's held on with four sheet metal screws and the knob) so that I could work on the filters easier and would have a better chance of not breaking any plastic. It's also good to wash the whole thing out and replace the foam strips that are glued to the metal chassis of the A/C that press against the outlet nozzles at either end to stop air leaking past them and to hold them in place when you adjust them.

To get at the guts of the A/C unit you will have to remove the upper portion of the shroud which entails removing the pesky 4 screws on top of the shroud and then drilling out the rivets holding the two shroud halves together at the beltline. I blew the coils on mine out with a shop vac set up to blow from the outside. Don't know if it made a big difference or not.
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Old 05-13-2010, 09:30 PM   #20
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Thanks everyone. I got the shroud off, cleaned the coils, and figured out where the filters go. Worked on it all day. It ran 30 minutes, tripped the breaker, now the fan won't run. Back to the drawing board. I did figure out that it is an Armstrong with a heater. Anyone know how to tell how old it is by either the model or serial numbers?
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Old 05-14-2010, 12:37 AM   #21
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Thanks everyone. I got the shroud off, cleaned the coils, and figured out where the filters go. Worked on it all day. It ran 30 minutes, tripped the breaker, now the fan won't run. Back to the drawing board. I did figure out that it is an Armstrong with a heater. Anyone know how to tell how old it is by either the model or serial numbers?
The last year Airstream used a 2 piece shroud, was 1979.

That model of Armstrong AC was used from 1976 to 1979.

Thyat makes your AC 31 years old (young), as it was and is a good AC.

If you ran the AC using an inadequate extension cord, you may have ruined the compressor.

Andy
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Old 05-16-2010, 09:09 PM   #22
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I have tracked the problem to the fan motor. I would just try to replace it, but I can't get the fan blade or blower off the shaft. I have loosened the set screws but apparently 30 years makes them stubborn. Any suggestions? I can't find a way to get leverage on either since there are coils at both ends. Another thing that concerns me is that before it quit, the compressor was cycling on and off every 5 minutes or so. Is that normal?
If we have to get a new one, what is the best one to look for?
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Old 06-23-2010, 07:54 PM   #23
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1972 27' Overlander
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armstrong ac roof fan replacement

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Originally Posted by redhawkerII View Post
When working on our shroud (getting dirt and small acumulation out) there were four screws that held it in place...there was no glue or anything like Andy mentions on this one and it just raises right up in a such and such manner.
The fan on the roof of my Armstrong ac spins hard and sometimes will not start if I get on roof and help it with a push it starts to spin and cools well.

Can this fan motor be oiled without removing shroud.

Is this motor able to be replaced?

I am camping at cedar point Ohio and don't want to be without ac

If needed anyone know of a good ac repair that would work on an Armstrong unitnear cedarpoint

Steve
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Old 06-23-2010, 10:12 PM   #24
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Bump
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Old 06-23-2010, 11:10 PM   #25
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The fan on the roof of my Armstrong ac spins hard and sometimes will not start if I get on roof and help it with a push it starts to spin and cools well.

Can this fan motor be oiled without removing shroud.

Is this motor able to be replaced?

I am camping at cedar point Ohio and don't want to be without ac

If needed anyone know of a good ac repair that would work on an Armstrong unitnear cedarpoint

Steve
Lubing the fan motor, will extend it's life for many more months of service.

Andy
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Old 06-24-2010, 08:41 AM   #26
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Can the fan on roof be oiled from roof without taking off shroud?
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Old 06-24-2010, 09:22 AM   #27
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Can the fan on roof be oiled from roof without taking off shroud?
No.

There is a screen in the way, that can be removed, but you have to remove the shroud first.

Andy
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Old 06-25-2010, 03:05 PM   #28
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1972 27' Overlander
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ac sometimes will not start

I have a 1972 27 ft international with the original Armstrong ac TR 21-12.

Recently the fan on roof that cools fins (I believe it is the condenser fan) hums and turns slowly but will not start. This seems to happen most often on low. I tried to lube fan but not sure where to lube. When the unit is off and I try to spin the fan it is somewhat stiff. Is there a replacement for this fan motor? Does it sound like a fan motor or something else?

Steve
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