Heater Core: Testing and Inspection

1. INSPECT EVAPORATOR
a. Check evaporator fins for blockage.
If the fins are clogged, clean them with compressed air.

NOTE: Never use water to clean the evaporator.

b. Check fitting for cracks or scratches.
If necessary, repair or replace.

2. INSPECT HEATER RADIATOR
Inspect fins for blockage.
If the fins are clogged, clean them with compressed air.