Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-12-2012, 10:55 AM   #1
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
AC Issues

Its hot here and I'm having problems with my AC!

It's a 71 Excella, recently purchased. A few weeks ago, the AC worked fine but now when I turn it on, it cools for about 30-60 seconds, starts to slow down, makes a loud pop sound (like the breaker or something) and then blows warm air.

I am in an RV Park so I am connected to a 50 AMP source; I have a brand new battery (a car battery - 500 cranking amps); my Airstream does have a Univolt converter I believe (fuse looks ok to me); not running any other major appliances.

Any ideas? Does the AC run off of the battery at all or just the main power source?
__________________

__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 11:11 AM   #2
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,809
Images: 12
The AC runs on 110 volts and has no connection to any of the 12 volt systems.

First thing to do is check the voltage the campground is supplying. If below 105 that may be the problem. Low voltage will cause the unit to draw added current and that can cause the unit to shut down for self protection.

Secondly if it is very hot outside and the box is hot that also will cause a heavy load on the unit and may give the same result.
__________________

__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-12-2012, 12:16 PM   #3
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,119
What you describe is probably caused by a lack of airflow over the condenser coils. Usually this is because they are blocked by leaves or other debris; more rarely, it's because the fan is damaged. The problem can be corrected by climbing on the roof of your trailer, removing the air conditioner shroud, and cleaning up the mess or replacing the fan blades as the case may be.

Be careful to be sure power is disconnected and locked out, and don't fall. There are a number of threads on airforums explaining how to get up on the roof without damaging your trailer or falling off.
__________________
To learn to see below the surface, you must adjust your altitude
Jammer is offline   Reply With Quote
Old 07-12-2012, 12:25 PM   #4
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
OK thanks... I am going to go check it now. Will report back in a bit
__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 02:04 PM   #5
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
OK I just cleaned out the entire AC unit (removed the shroud, coils etc. and vacuumed out the debris - there was a lot). It lasted a bit longer before it popped and quit blowing out cold air. It does sound like it is having a hard time.

FYI - we've been on 2 campgrounds - 1 was a KOA and now a local RV park and both have plenty of wattage (so I am told). Everyone else around me is ok with their trailers (no Airstreams of course).

Any other ideas??
__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 02:08 PM   #6
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
Update: I went on the roof while we turned it on and for about 30 seconds it ran but the fan did not move at all. What can I do to replace the fan or get it working?
__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 02:31 PM   #7
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,809
Images: 12
OK you have defined the problem. NO fan high head pressure and the compressor shuts off on it's thermal overload.

Try moving the fan by hand a bit and then turn it on. If the fan runs you may get away with it for a while. If the fan does not run the motor may be shot and replacement is in order. That can be done without losing the charge in the unit so it is worth considering if yo can find someone to do it.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 07-12-2012, 03:07 PM   #8
Rivet Master
 
68 TWind's Avatar
 
1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
Posts: 1,420
Could be a relay or capacitor.
__________________
__________________
Bruce & Rachel
__________________
68 Trade Wind
2001 Toyota Tundra
68 TWind is offline   Reply With Quote
Old 07-12-2012, 03:14 PM   #9
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,119
I'm a little puzzled because most RV air conditioners have a single fan motor that drives both the interior and exterior fans, so they both fail at once. But your interior fan is working.

Maybe the collar for the fan blades is broken so the shaft turns but the blades don't, or maybe the motor shaft is broken. If you try to turn the blades by hand (with the power off and locked out) and push and pull gently on them you should be able to tell.

If the exterior fan has its own motor then chances are that the bearings are seized up. You can find out for sure by turning it by hand (power off and locked out), if it turns hard or not at all then that's what you're dealing with. Sometimes you can get it to work for a little while by turning it around by hand a few dozen times to free up the bearings but ultimately you'll have to replace the motor.

If the motor turns OK by hand but doesn't run under power then chances are that a wire was cut or pulled loose, either by a small animal or as a result of cleaning out the debris. Otherwise it might be a bad fan motor capacitor. They usually don't fail unless the case has rusted through and the oil has started to leak out. There's an outside chance that the motor has failed electrically but that's pretty rare.
__________________
To learn to see below the surface, you must adjust your altitude
Jammer is offline   Reply With Quote
Old 07-12-2012, 03:46 PM   #10
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
Looks like HowieE was right on this one...

I turned on AC, got on the roof and gave the fan a spin (with a piece of wood of course) and it worked. I'm assuming I will have this problem until I replace or repair the motor. Feel free to chime in on recommendations on this part. It is the original motor/AC unit as far as I can tell.

FYI for other people reading this post; my fan blade was very easy to turn by hand (stick) with the power off so HowieE diagnosed it wasn't necessarily the fan. My unit has sat a lot.
__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 04:45 PM   #11
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
Looks like HowieE was right on this one...

I turned on AC, got on the roof and gave the fan a spin (with a piece of wood of course) and it worked. I'm assuming I will have this problem until I replace or repair the motor. Feel free to chime in on recommendations on this part. It is the original motor/AC unit as far as I can tell.

FYI for other people reading this post; my fan blade was very easy to turn by hand (stick) with the power off so HowieE diagnosed it wasn't necessarily the fan. My unit has been stored quite a long time.
__________________
africaroots is offline   Reply With Quote
Old 07-12-2012, 04:58 PM   #12
Wise Elder
 
Jammer's Avatar
 
2010 30' Classic
Vintage Kin Owner
South of the river , Minnesota
Join Date: Dec 2009
Posts: 4,119
If the fan motor has a capacitor you may be able to get away with just replacing that.
__________________
To learn to see below the surface, you must adjust your altitude
Jammer is offline   Reply With Quote
Old 07-12-2012, 05:35 PM   #13
Rivet Master
 
68 TWind's Avatar
 
1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
Posts: 1,420
If it runs with you spinning the blade it is most likely the start capacitor. Exactly which model AC do you have?
__________________
__________________
Bruce & Rachel
__________________
68 Trade Wind
2001 Toyota Tundra
68 TWind is offline   Reply With Quote
Old 07-13-2012, 02:00 PM   #14
2 Rivet Member
 
1971 31' Excella 500
Sacramento , California
Join Date: Jul 2010
Posts: 45
Quote:
Originally Posted by Jammer View Post
If the fan motor has a capacitor you may be able to get away with just replacing that.
Quote:
Originally Posted by 68 TWind View Post
If it runs with you spinning the blade it is most likely the start capacitor. Exactly which model AC do you have?
I think an Armstrong (Serial number 976160, model TRC2-12, CW17).
__________________

__________________
africaroots is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:44 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.