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. Turn the blower off.
2. Wait 10 minutes.
3. With the blower on the lowest speed insert the leak detector probe into one of the center instrument panel outlets. Try to get as close to the evaporator as possible.
4. A solid alarm on the detector indicates a leak.
5. An evaporator core leak may be detected after a dye injection by using the J 42220 to inspect the drain port area.