Air Conditioner: Starved evaporator (partial frost, poor cooling)
Starved evaporator (partial frost, poor cooling) on a air conditioner: Possible causes and checks for: starved evaporator (partial frost, poor cooling).
Common causes of starved evaporator (partial frost, poor cooling)
- Low charge (leak)
- Partially clogged cap tube/drier
- Undersized cap tube
How to fix starved evaporator (partial frost, poor cooling): step by step
- Low side low, evap outlet warm, high side low = shortage → find leak. Restriction: head very high + suction into vacuum
- Frosted drier
- Nitrogen flow test to isolate drier vs cap tube
If the unit shows an error code, look it up: Carrier Air Conditioner codes Goodman Air Conditioner codes KeepRite Air Conditioner codes Lennox Air Conditioner codes Trane Air Conditioner codes
Source: General HVAC service practice — verify per model. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.