Evaporator Case: Testing and Inspection
INSPECTION1. INSPECT AIR MIX SERVOMOTOR
a. Inspect the air mix servomotor operation.
1. Connect the positive (+) lead from the battery to terminal 7 and negative (-) lead to terminal 6, then check that the arm turns to "COOL" side smoothly.
2. Connect the positive (+) lead from the battery to terminal 6 and negative (-) lead to terminal 7, then check that the arm turns to "WARM" side smoothly.
If operations are not as specified, replace the servomotor.
b. Inspect position sensor resistance. Measure resistance between terminals at servomotor arm each position as shown in the chart.
If resistance is not as specified, replace the servomotor.
2. 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.
3. INSPECT HEATER RADIATOR
Inspect fins for blockage.
If the fins are clogged, clean them with compressed air.