Case 580SR Service Manual page 809

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EVAPORATOR
1. Discharge and reclaim refrigerant gas using cer-
tified recovery systems.
2. Remove the seat and cover plate to reveal evap-
orator assembly (1).
3. Remove temperature cycling control thermocou-
ple.
4. Disconnect tubing to expansion valve.
5. Remove evaporator.
6. Check the evaporator assembly fins for damage.
Straighten fins if necessary.
7. Clean the evaporator core of all foreign material
to be sure it is free of obstructions.
8. Check the evaporator assembly for indications
of refrigerant leakage. If damage or leaks are ev-
ident, replace the evaporator core.
If a new evaporator is to be installed drain the refrig-
erant oil in the evaporator into a clean calibrated
container. Measure the quantity of oil obtained and
add the same quantity of new refrigerant oil directly
into the replacement evaporator core.
Install evaporator using disassembly procedure in
reverse.
Evacuate, leak test and recharge the system.
AIR CONDITIONER TEMPERATURE CYCLING
CONTROL
1. Remove the seat mounting plate.
2. The temperature cycling switch (2) is mounted to
the side of the blower motor assembly.
3. Carefully pull and disconnect the switch wiring at
the connector.
4. Remove temperature control switch and replace
as required.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
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