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In hottest part of day it starts blowing hot air. We turn it off for 2-3 hours and comes back on anabnd blows cold air again. Technician unable to determine problem. Says we should buy all new unit. Current unit 10 years old. Coolent level ok. Coils clean. This is a 2 ton small unit cools our master suite only. Our other unit is 4 tons and cools rest of house with no problem.

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For this case, either the AC needs cleaning or the compressor may be week.  You may want to check on the thermostat, it may send signal to the unit to stop cooling.  If it is a split type AC, you may want to check for leaks in the tubes that connect the 2 halves of the AC if it is ok but still cleaning and the AC motor may be the culprit.  Other irregularities observed may help in the diagnosis.

Posted on Jun 14, 2009

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