Evaporator Core

One of the most difficult leaks to find is in the evaporator core. Complete the following steps in order to test the core for leaks:
1. Turn the blower on HI for 15 or more seconds.
2. Turn the blower OFF.
3. Wait 10 minutes.
4. Remove the HVAC filter access door.
5. Remove the HVAC filters.
6. Insert the leak detector probe into the opening. Place the leak detector as close to the evaporator as possible.

A solid alarm on the detector indicates a leak.