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Old 06-11-2015, 10:16 PM   #1
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Air Conditioner Went From Big Blast to Small Blow

Turned a/c on for the first time a couple of days ago. Was really putting out a good blast of cool air, especially when on high.

Today there is barely a breeze (when on high). I turned the temp. up in case it was overworking to 69F - still is barely putting anything out.

And help/hints?
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Old 06-11-2015, 10:53 PM   #2
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Evaporator coils could be frozen up this would block airflow.
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Old 06-11-2015, 10:54 PM   #3
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What is park voltage? Check the plug on post for overheating! Try not to run until figured out. If on 30 amp you can test most any outlet for voltage.
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Old 06-11-2015, 11:06 PM   #4
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Mine does this a lot. Run the unit "fan only" for an hour or so to defrost the coil. Then you will have your full blast again.
Sure telltale sign of frosted up coils is a stuffy sound and poor air output--with no condensation dripping from the outside drain.
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Old 06-12-2015, 12:30 PM   #5
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Which is usually caused by dirty coils that cause it freeze up. If the system has been opened and someone charge the Freon and overcharge it, this will cause ice build-up on the coils.
CLEAN THE COILS!
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Old 06-12-2015, 12:58 PM   #6
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Okay. Have a/c on "Fan only."

Trying to find link that will tell me how to clean coils.
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Old 06-12-2015, 01:05 PM   #7
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Do I have to get onto roof like this?????

Cleaning the AC coils - (Lots of pic's) - Sunline Coach Owner's Club
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Old 06-12-2015, 06:52 PM   #8
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You are right to run the unit fan only for a while. If your unit is a heatpump turn it on heat set t'stat for as high as it will go and let it run for 3-5 minutes. This should defrost the coil very quickly.

two more possible problems:

1. Make sure the indoor air filters are clean. Leave out when in heating mode to speed up the defrost.
2. You need to check the wiring connections:
a. At the breaker. The screws should have about 50 lb-in of torque on them
b. At the unit. To check these you have to remove the indoor grill 6-8 screws on mine. You can then see the sloppy wiring. Find the non-metalic cable feeding the A/C it is usually connected with wire nuts. I have found that the wire nuts that they use are not suited for mobile applications and will vibrate loose very easily. Make sure the breaker is off when checking these connections. A crimp connection is the best when properly installed. However, in a pinch I like the Buchanan B-2 RED wire nuts. They are flexible so they conform to the wire insuring a good strong tight connection if properly installed.

Just to be on the safe side do a visual inspection of the outdoor coil to make sure it isn't plugged with leaves.

If making sure all is wired properly and coils are clean, the next probable cause for the freezing coil if that is what the problem is would be an under charge of refrigerant. An over charge would cause high head pressure and then shut down and then warm air blowing. But sense you said that the air flow starts out strong and then dwindles to a weak blow this is a classic sign of a frozen coil.

Please be careful when checking the connections to the A/C.
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Old 06-12-2015, 07:02 PM   #9
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Be careful about getting onto the roof. Use a blanket or big towel to protect the aluminum sides from the ladder. You can only support yourself on the roof where there are ribs. They are spaced quite widely. I was easily able to work from the ladder.

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Old 06-12-2015, 09:08 PM   #10
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Two BRAND NEW 15,000 btu units (This is TEXAS). Coils are virgin clean. Lots of humidity in the air due to recent weather events.Click image for larger version

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Old 06-12-2015, 11:45 PM   #11
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Thanks for all your help.

But, I'm afraid the thought of getting onto the roof to look at the air conditioner makes me freeze!

Will try the fan only cycle again tomorrow, then see how it blasts.
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Old 06-12-2015, 11:50 PM   #12
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Quote:
Originally Posted by cwf View Post
What is park voltage? Check the plug on post for overheating! Try not to run until figured out. If on 30 amp you can test most any outlet for voltage.
I'm driveway camping - plugged into outlet in garage which is 20 amp, I think.

Is this too weak for a/c?
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Old 06-13-2015, 05:43 AM   #13
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Yes, for one A/C you must have true 30AMP, for two you need 50AMP. 20 is not enough.
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Old 06-13-2015, 01:10 PM   #14
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paiceman, the a/c also did this when I was plugges into 30 amps at RV park.
I will look into getting 30 amp outlet, though.

Anyway, did the fan only setting for an hour and tried it again this am. She is blowing hard and cold again. For how long? We'll see. Maybe I'll get lucky and the trailer will resolve the issue itself again.
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