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Low Freon cause freeze Ami Miron 8-30-02  
I have an AC wich freezes, both on the condenser and the evapotator: filters are clean,thermostat goes on/off periodicly so it is likely the system is short in Freon.
Why less Freon cause freeze?
What will happen if there is extra Freon in the system?
Re: Low Freon cause freeze Russel 8-30-02  
Which AC is freezing? dash or roof?
Re: Low Freon cause freeze Sam Watson 8-30-02  
Low Freon charge will cause all the conditions you mention. Freezing in the system occurs when the Freon starts expanding too soon after leaving the compressor. The cycling you mention, which is normal in some systems that use a fixed orifice, would also be caused by a low pressure switch cycling on and off. Recharging is best left to an AC service, they have the gauges and knowledge to perform this task. Too much Freon in a system can damage the compressor.
Re: Low Freon cause freeze Ami Miron 8-31-02  
Sam,that's a good point you mentioned.Further more I've found out that the blower of the evaporator is very clogged with dirt,leaving out not to much space for air to flow;So I suspect the cold air could not get out from the system and caused the tubes to freeze,blocking air flow even more,since the "intake" passage was full of ice. After vacuming the blower and cleaning all air ducts - shazam !!! A/C regained almost all its cooling power and it is not freezing any more from the inside (evaporator),only a bit on the outside on the condenser's tube,right after compressor output.So I guess there is still lack of Freon in the system as Sam indicated. !! thanks very much.
Re: Low Freon cause freeze Joe 8-31-02  
The freezing you see is on the lines going TO the compressor not FROM the compressor. The freon leaving the compressor is under high pressure and very hot. The returning freon from the evaporater is very cold and under humid conditions will cause ice to form on the line from the evaporater to the compressor. I'm not saying you don't need a top off of freon, but I have seen many properly operating systems freeze like this. Best get it checked if you are in doubt.
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