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Old 06-13-2011, 04:08 PM   #1
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Wrong Kind of Freeze...


My central air unit has been freezing up over the past few days. Not the typical freeze, this only last for 5-10 minutes or so, then everything returns to normal for 1 to 2 hours. I have had the HVAC men here twice. The first time they said the coil was dirty, which I'll agree, it was. They Cleaned it, which cost me $200. The unit seemed to be working fine, and blowing harder than ever might I add, but after about 2 hours. It froze up again. So I called them back out, they checked the blower motor, the capasitor to the blower motor, and everything checked out good. They checked the level of gas, and added roughly one fourth of a pound. This was $80, They left and about an hour later, it freezes up again. I am at a loss. I can't continue to fork out money. What is the problem?

Might I add, that the filter is brand new.

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Old 06-13-2011, 04:16 PM   #2
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Wrong Kind of Freeze...


When you say blowing hard, from how many vents?

It could be that you are not moving enough air across the evap coil. Do you have vents closed?

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Old 06-13-2011, 04:42 PM   #3
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Wrong Kind of Freeze...


No vents closed, they all blow good amounts of air.
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Old 06-13-2011, 04:49 PM   #4
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Wrong Kind of Freeze...


Is this the first time you have used this AC unit in this house, or were you there last year?
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Old 06-13-2011, 04:54 PM   #5
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Wrong Kind of Freeze...


I have been here 5 years. Only other issue I've had was with the Fan Start Capasitor on the outside unit.
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Old 06-13-2011, 05:06 PM   #6
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Wrong Kind of Freeze...


where are you seeing the ice first off
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Old 06-13-2011, 07:53 PM   #7
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Wrong Kind of Freeze...


Probably a txv giving intermittent problems. Two things cause freeze up,not enough air across the coil and not enough refrigerant getting in the coil. Since the evap coil is clean and the blower is working well then it's refrigerant related. Low on charge wouldn't freeze then thaw with the unit still running so we're left with the metering device. Not really a DIY repair.

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