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Services > Air Conditioning & Heating> Air Conditioning System Parts > AC Evaporator


Function: Absorbs heat from the cabin air and removes its moisture. (Water is typically visible beneath the vehicle when the A/C system/evaporator has been operating.)


Signs of Wear: Insufficient cooling of the vehicle cabin.

The evaporator is used to exchange heat between the ambient air and the refrigerant in the air conditioning system.


How they work

The expansion valve and/or orifice tube injects the highly pressurized liquid refrigerant into the evaporator. The refrigerant then expands and evaporates. The resulting cold evaporation is discharged into the environment via the large surface of the evaporator and routed to the vehicle interior through the ventilation airflow.


Effects of failure

A defective evaporator exhibits the following symptoms:

  • Poor cooling performance
  • Failure of the air conditioning system 
  • Poor ventilation performance


Causes for failure of the evaporator can be:

  • Pipes blocked in the evaporator
  • Evaporator leakage (at the connection caused by damage)
  • Evaporator contamination (air passage disturbed)

Air Conditioning Component: AC Evaporator- Houston's Premier Auto Repair Facility