AC overflowing and frozen: drain sealed, TXV bulb insulated
Last updated Reviewed by Waseem Shahzad, Lead Technician
Dix Hills, NYAC RepairTechnicians: Umar and WaseemAugust 2025
Water in the overflow pan and a frozen coil. An open drain connection and a poorly insulated TXV sensor were fixed, and the condenser cleaned.
What the homeowner reported
The homeowner reported that the air conditioner was overflowing, with water in the overflow pan.
What we found
The front of the indoor coil and the suction line were frozen, with water in the safety pan. The return filters were changed. After the ice melted, pressures read low, and adding refrigerant made the coil freeze again, so the team let it thaw overnight. On the second visit they found the real problem: an open drain connection was letting the unit pull air in, and the TXV sensor needed better insulation.
What we did
Umar and Waseem sealed the drain opening with a PVC cover, insulated the TXV temperature sensor and chemically cleaned the condenser coil with the jacket removed.
Visits and time on site
Two visits: the coil was left to thaw overnight, and the team returned the next morning to test and repair it.
The result
With the drain sealed and the sensor insulated, the system was cooling without freezing.
Job details are from our August 2025 service record for this Dix Hills home. Customer details are left out.
General information, not details from this job
About diagnosing a frozen coil
A frozen coil hides its cause. Pressures read low while it is iced, which can look like a refrigerant leak, and adding refrigerant then makes things worse. Letting the coil thaw fully before testing avoids that mistake. The TXV's sensing bulb needs to be strapped tight and insulated on the suction line. If it reads the wrong temperature, the valve feeds the coil incorrectly.
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