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The defrost heater is a 33-ohm glass tube style
heater which is mounted to the bottom of the
evaporator coil.
Defrost Heater Diagnosing
The heater can be tested by using Service Mode
Test t11 and testing voltages at the main board or
heater.
J7 to J19 on Main Board
• J7 pin 9 (
orange
) to J19 pin 2 (
blue
): 120
VAC
• J7 pin 9 (
orange
) to J19 pin 2 (
blue
): 33
ohms
If defrost circuit is open, check the thermostat
at the
orange
wire at the 9-pin connector to the
pink
wire on the defrost heater to verify the that
an open defrost thermostat is not at fault.
Defrost Heater Removal
1. Remove the evaporator cover (see
Evaporator Cover Removal
steps).
2. Bend the tabs of the evaporator bracket
towards the back liner to release the heater
from the evaporator.
3. Disconnect the defrost heater connectors.
The evaporator coil is an aluminum set of coils
located in the freezer. The refrigerant in the
aluminum coils pulls the heat energy from the air
circulated across it by the evaporator fan causing
the air to become cold.
Evaporator Removal
1. Remove the evaporator cover (see
Evaporator Cover Removal
steps).
2. Remove the icemaker blower fan.
3. Unclip the defrost thermostat and evaporator
thermistor from the evaporator tubing.
4. Disconnect the ground wire from the
evaporator coil bracket.
5. Disconnect the 9-pin connector for the
evaporator harness by squeezing the tabs on
the top and bottom of the connector.
6. Follow recovery procedure and disconnect
the inlet and outlet lines of the evaporator.
7. Loosen two 1/4 in. hex-head screws and lift
the evaporator off the screws.
8. Remove the defrost heater and evaporator
harness from the evaporator (foam blocks on
the left and right side of the evaporator will
need to be reused on the new evaporator).
Defrost Heater
Evaporator
