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Originally Posted by KATSCAN
Well, perhaps starve is not the correct term..but if the evaporator is frozen, lets say it's because you've modified the Evap Temp Sensor too low of a value. the TXV is closed yet the compressor keeps running putting a lot of stress on it.
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First, why would anyone modify a txv to close completely? Can that even be done? Aren't you playing around trying to
increase refrigerant flow through the evaporator, and not limit it?
Second, a 'frozen' evaporator refers to ice on the outside. Refrigerant is still happily circulating inside the system.
Which brings us to an obvious limit in the A/C system. The evaporator. If the evaporator is allowed to reach a temperature lower than 32F, the moisture condensing out of the air will freeze on the evaporator instead of dripping off and draining away. Therefore, the evaporator cannot be colder than 32F. At least, not if you want the system to provide cold air. 35–40F is the practical limit. All the valve and thermistor twiddling in the world will not change this. If an A/C system does not maintain the evaporator temperature below 40 degrees and above 32 degrees, improvements can be made. But only until the correct evaporator temperature is achieved.