09/24/2026
The evaporator coil was also heavily pitted, especially around the return bends and elbows on both sides. The TXV and surrounding copper were showing heavy corrosion and pitting as well.
Based on the condition of the coil, I advised the customer that the system is most likely experiencing multiple micro-leaks in these heavily pitted areas. A leak detection test was not necessary to determine that the evaporator coil has reached a point where refrigerant leakage is a major concern.
Because I have never serviced this unit before, I cannot guarantee how long it will continue operating after being repaired or recharged. I also do not know how long the system had been losing refrigerant or how long it had been operating improperly before I arrived.
When an evaporator coil gets this heavily corroded and pitted, repairs may only be temporary and replacement of the coil or equipment should be considered.