AC blows cold, then air pressure declines after a while

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  #1  
Old 05-28-14, 02:24 PM
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AC blows cold, then air pressure declines after a while

So i have a repair guy coming next week to check it out, but thought i'd attempt to see if there is an easy fix or something i'm overlooking..

My aunts place is a mobile, has a coleman brand ac/heater unit. the AC turns on when its supposed to and blows cold. the problem is that after about 15-20min the pressure of the air coming out of the vents starts to decline until its all but "oozing" out. i turn off the outside unit, leave the system fan in the "on" position and then after about 10min its back to blowing full pressure again.

it reminds me of one of those old evaporators my mom had in her basement. the coils would freeze over every now and then and it would stop working.

anyone have a thought?
 
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Old 05-28-14, 02:31 PM
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That's what i was thinking, frozen coil. Make sure the filter is clean.
 
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Old 05-28-14, 02:42 PM
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i've changed all the filters...is there anything i can do or is it something a service guy has to take care of?

oh and btw, i'm originally from Missouri too
 
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Old 05-28-14, 03:38 PM
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The good news is that it's a downflow. You have to access the door on the very bottom and go in and clean the coil with a brush...a spray bottle with a stream of water is helpful too. Sometimes no fun getting in there with a gas line and refrigerant lines in the way. I've had to take tin snips to some and be ready to patch after you are done.
 
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Old 05-28-14, 04:52 PM
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are you talking about the unit inside the house? i removed the panels but don't see any way to access the internal parts without unhooking gas lines. i haven't looked at the unit outside or taken the shroud off to see what its doing.

i looked up diagrams for this coleman, its model 7956-856. i'm questioning now if i actually changed all the filters, it looks like there are two on the top. i only knew of the one on the front.
 
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