Warm air from a newer AC: dirty filter and a loose TXV
Last updated Reviewed by Waseem Shahzad, Lead Technician
Lake Ronkonkoma, NYAC RepairTechnician: WaseemJune 2026
A system installed in 2025 was blowing warm air. We replaced a dirty filter and fixed a loose thermostatic expansion valve.
What the homeowner reported
The homeowner, new to the house, reported that the system was not blowing cold air. The unit had been installed in 2025 and they did not know who installed it.
What we found
Two problems: a dirty air filter restricting airflow, and a loose TXV (thermostatic expansion valve), the part that meters refrigerant into the indoor coil.
What we did
Waseem replaced the air filter with a new HEPA filter and fixed the TXV.
The result
After the filter change and the TXV repair, the system was cooling properly again.
Job details are from our June 2026 service record for this Lake Ronkonkoma home. Customer details are left out.
General information, not details from this job
About expansion valves
A TXV opens and closes to feed the right amount of refrigerant into the indoor coil as conditions change. If its sensing bulb or fittings are loose, it can starve or flood the coil, and the result is weak cooling or warm air even on a newer system. Pairing that check with the filter matters: a clogged filter cuts airflow across the coil, which on its own can make a healthy system struggle. Both are worth ruling out before anyone suggests refrigerant or major parts.
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