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Automotive AC Evaporators - Select your Make

AC Evaporator Information

A/C Evaporator Diagnoses
Diagnosing a refrigerant leak at the AC Evaporator can be difficult. Visual inspection alone cannot be performed since the evaporator is mounted inside the heater case. With replacement time for some AC evaporators exceeding 8 hours, being certain of the diagnosis will help avoid costly mistakes.

Leaking refrigerant falls to the bottom of the evaporator case because it is heavier than air. A common location to check for a leak is the evaporator case drain tube. Use an approved method, like an AC leak detector to diagnose a leaking AC Evaporator.

Keep in mind, that on several vehicles a thermostatic expansion valve (TXV) is also mounted inside the evaporator case. A leak that is detected can be from the evaporator, TXV or the fitting connection between the two components. Once the case has been opened a visual inspection for oil residue will determine the location of the leak. On difficult repairs, it may be wise to replace both components.