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 S 035-037
 (2)  Disconnect the electrical connector, D486, from the left pack valve.
 S 865-038
 (3)  Move the L PACK switch to AUTO.
 S 865-039
 (4)  Move the AIR TEMP switch to PASS CABIN.
 S 975-040
 (5)  Monitor the temperature indicator and make a record of the cabin temperature.
 S 885-041
 (6)  If the cabin temperature is less than 65°F (18°C), do this step: (a) Use the specified heat source equipment to increase the temperature of the cabin temperature sensor to 75|1.5°F (24|.83°C).
 S 885-042
 (7)  If the cabin temperature is more than 85°F (30°C), do this step: (a) Use the specified cool source equipment to decrease the temperature of the cabin temperature sensor to 75|1.5°F (24|.83°C).
 S 865-043
 (8)  Put the CONT CABIN - AIR MIX VALVE to its middle position: (a) Move the CONT CABIN temperature selector switch to MANUAL WARM. (b) Make sure the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves to the middle position (12 o'clock). (c) Move the CONT CABIN temperature selector switch to AUTO NORMAL position. (d) Adjust the CONT CABIN temperature selector switch until the indicator needle of the CONT CABIN - AIR MIX VALVE indicator
 stays at the middle position.
 S 865-044
 (9)  Move the CONT CABIN temperature selector switch counterclockwise.

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737-300/400/500MAINTENANCE MANUAL
 S 215-045
 (10)
 Make sure the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves toward COLD.

 S 865-046

 (11)
 Move the CONT CABIN temperature selector switch clockwise.

 S 215-047

 (12)
 Make sure the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves toward HOT.

 S 865-048

 (13)
 Move the CONT CABIN temperature selector switch counterclockwise until the indicator needle stays at the middle position.

 S 715-049

 (14)
 Do a test of the duct limit sensor, T419:

 (a)  
Remove the duct limit sensor but do not disconnect its electrical connector.

 (b)  
Use the heat source equipment to increase the temperature of the duct limit sensor to 140°F (60°C).

 (c)  
Make sure the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves to COLD.

 (d)  
Let the duct limit sensor become cool.

 (e)  
Install the duct limit sensor.

 

 S 865-050
 (15)
 Push the CONT CABIN - DUCT OVERHEAT light momentarily and make sure the light comes on and then goes off.

 S 865-051

 (16)
 Do the procedure to put the left air mix valve in its middle position.

 S 715-052

 (17)
 Do a test of the duct overheat switch, S11:

 (a)  Remove the duct overheat switch but do not disconnect the electrical wires.
 CAUTION: DO NOT LET THE TEMPERATURE OF THE OVERHEAT SWITCH PROBE
_______ GET HOTTER THAN 200 DEGREES F (93 DEGREES C). THIS CAN CAUSE DAMAGE TO THE OVERHEAT SWITCH.
 (b)  
Use the heat source equipment to increase the temperature of the duct overheat switch to 190|10°F (88|5°C).

 (c)  
Make sure these lights come on:
 1) CONT CABIN - DUCT OVERHEAT light
 2) MASTER CAUTION and AIR COND annunciator lights

 (d)  
Make sure the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves to COLD.

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A 737-300/400/500MAINTENANCE MANUAL
 (e)  
Connect the electrical connector, D486, to the left pack valve.

 (f)  
Move the L PACK switch to OFF.

　
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