Evaporator Core

Evaporator Core


One of the most difficult leaks to find is in the evaporator core. The core is encapsulated into a closed module. The core is inaccessible to leak detector devices. Use the following procedure in order to test the core:
1. Turn the blower fan on HIGH for 15 seconds. Shut the fan off.
2. Wait 10 minutes.
3. Remove the blower motor or the blower resistor.
4. Insert the leak detector probe into the opening. The detector going to a solid alarm is an indication that there is a leak.
5. If possible, use a flashlight in order to visually inspect the core face for evidence of refrigerant oil.