– 44 –
11. Connect the evaporator inlet and outlet to the
suction line and capillary tubes.
12. Check that the thermal paste is still on the
suction line where it enters the rear wall of the
freezer. If not, apply paste. In addition, apply
thermal paste around epoxy joints on the new
evaporator to prevent the heat from damaging
joint integrity.
13. Move the brazing shield behind the capillary and
suction line joints. Protect the freezer
fl
oor from
molten solder during brazing.
14. Angle torch so that
fl
ame is directed away from
rear wall when brazing. Braze suction line and
capillary to new evaporator.
15. Remove the brazing shield. Clean and inspect all
joints.
16. Remove the old drier by cutting the halo loop
as close as possible to the drier. Install the
new drier assembly making sure that there is
suf
fi
cient space between the tubing.
17. Install the access tube. Clean and inspect joints.
18. Replace the heater supplied with the evaporator.
Reinstall the over-temperature thermostat,
thermistor, and heat transfer wires at the sides
of new evaporator. Dress wiring.
19. Evacuate and charge the system. Use original
factory charge quantity of R-134a. (See
Evacuation and Charging Procedure
.)
20. Replace all component parts in the freezer.
21. Reinstall the rear access cover.
Replacing Evaporator Using the LOKRING
Method
Parts Needed:
Freezer Evaporator
•
Drier Assembly
•
Access Tube (part # WJ56X61).)
•
LOKRING
•
Connectors (part # WR97X10044)
Note:
If it is determined that the epoxy joints (the
transition joint between the aluminum and copper
jumper) on the freezer evaporator assembly are
defective, then LOKRING connectors can be used to
repair the joints. Refer to Service Guide #31-9067 for
complete instructions on using the LOKRING method
of installing an evaporator.
Defrost Heater
The defrost heater is a single-tube, glass-enclosed
radiant heater. It is held in place by 2 tabs on the
evaporator (1 on each side) and by a ceramic
and wire support. The defrost heater has an
approximate resistance value of 31.5
Ω
.
To remove the defrost heater:
Access the freezer evaporator. (See
1.
Evaporator
.)
Note
:
During defrost, the drain probe assists in
•
preventing the drain from icing closed. During
assembly, the probe must be installed on the
evaporator and inserted in the drain to prevent
drain freeze-up.
A ceramic and wire support prevents the heater
•
from sagging and touching the metal drain
trough if the glass is broken.
2. Remove the ceramic and wire support and the
drain probe from the evaporator.
Bend the aluminum tabs back (located at each
3.
end of the defrost heater) and lower the heater
out of the evaporator.
Disconnect 2 lead wires and remove the heater.
4.
Ceramic and Wire
Support
Drain Probe
