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Originally Posted by ILUVMILS
Hi pberku, another thing to consider is the climate at your location. During the winter, while your car isn't being used, the pressure in the evaporator is much lower than it is during the warmer months. Install a gauge on the low side and see what it says after the car has been sitting overnight in -5C weather.
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I was thinking about what you said, but than realized that in the winter the evaporator would actually be in higher ambient temperature not lower.
The reason I am saying this is that the evaporator is within the car's cabin, so in the winter, when the heater is on, the temperature of the cabin is usually higher than it is in the summer, when hopefully, with the AC running it is lower. Additionally, the evaporator is mounted right behind the hot heater. core. This further increases its temperature in the winter.