davidl Posted March 16, 2022 Share Posted March 16, 2022 My compressor is working fine. My machine is not cooling due to freeze up on the evaporator. What can be wrong? Link to comment Share on other sites More sharing options...
AngryChris Posted March 16, 2022 Share Posted March 16, 2022 Frost on r evaporator is normal, ice is not. I'm thinking you are low on refrigerant or you have a restriction Link to comment Share on other sites More sharing options...
davidl Posted March 16, 2022 Author Share Posted March 16, 2022 if it is low on freon how does it get low in the first place? Link to comment Share on other sites More sharing options...
AngryChris Posted March 16, 2022 Share Posted March 16, 2022 20 minutes ago, davidl said: if it is low on freon how does it get low in the first place? Usually pin hole leaks develop, particularly in the evaporator coils. The same thing happens in home AC systems Link to comment Share on other sites More sharing options...
davidl Posted March 17, 2022 Author Share Posted March 17, 2022 can moisture develop and cause low freon? Link to comment Share on other sites More sharing options...
lacanteen Posted March 17, 2022 Share Posted March 17, 2022 Low freon is caused by tiny leaks that develop over time. You could fill it and it might last 3 weeks, 3 months or 3 years. No way of knowing. Since the pressure is lower when it's running, it doesn't leak as much as when in hot storage. The evaporator in the cabinet is designed to remove water from the environment. The unit is not making coldness, it's removing the heat. As the air cools the water is removed in the form of frost that melts and drains then evaporates. Chances are good that if that unit is original, it is probably R-12 which is no longer used. Link to comment Share on other sites More sharing options...
AZVendor Posted March 17, 2022 Share Posted March 17, 2022 The photo shows a normal frost line. What other symptoms do you have? Does the evaporator start out that way and then develop ice across it? Link to comment Share on other sites More sharing options...
davidl Posted March 18, 2022 Author Share Posted March 18, 2022 it seems that the frost build up starts right away. within a few minutes and looks to be across the bottom part of the evaporator from where the coil is shown above. Link to comment Share on other sites More sharing options...
AZVendor Posted March 18, 2022 Share Posted March 18, 2022 If there is residual moisture in the bottom of the cabinet below the evaporator then clean out your drain hose so the water can drain. If the tank is dry then you are low on freon, IF you don't have any air leaks such as from a missing, warped or broken delivery door, a bad door seal or a t-handle that doesn't snug the door down. Your evaporator looks like it's from an ooooold Vendo so you would have an L-handle on the door. 1 Link to comment Share on other sites More sharing options...
davidl Posted March 31, 2022 Author Share Posted March 31, 2022 just wondering how 1 can determine what the low pressure side is and the high side. Link to comment Share on other sites More sharing options...
AZVendor Posted March 31, 2022 Share Posted March 31, 2022 On your compressor bell housing there will be a stub line that would have been crimped and brazed closed at the factory after they filled the unit. That is the low side place to tap the system. You will not need access to the high side. Link to comment Share on other sites More sharing options...
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