(d)  
Let the duct limit sensor become cool.

 (e)  
Install the duct limit sensor.

 S 865-068
 (16)
 Push the PASS CABIN - DUCT OVERHEAT light momentarily and make sure the light comes on and then goes off.

 S 865-069

 (17)
 Do the procedure to put the right air mix valve in its middle position.

 S 715-070

 (18)
 Do a test of the duct overheat switch, S14 or S991:

 (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) PASS CABIN - DUCT OVERHEAT light
 2) MASTER CAUTION and AIR COND annunciator lights

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

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737-300/400/500MAINTENANCE MANUAL
 (e)  
Let the duct overheat switch become cool.

 (f)  
Install the duct overheat switch.

 (g)  
Push the TRIP RESET switch, on the P5.10 panel.

 (h)  
Make sure the PASS CABIN - DUCT OVERHEAT, MASTER CAUTION and AIR COND annunciator lights go off.

 (i)  
Move the PASS CABIN temperature selector switch to MANUAL WARM momentarily.

 (j)  
Make sure the indicator needle of the PASS CABIN . AIR MIX VALVE indicator moves away from the full COLD position.

 (k)  
Move the R PACK switch to OFF.

 (l)  
Make sure the indicator needle of the PASS CABIN . AIR MIX VALVE indicator does not move toward COLD.

 (m)  
Connect the electrical connector, D490, to the right pack valve.

 (n)  
Make sure the indicator needle of the PASS CABIN . AIR MIX VALVE indicator moves to the full COLD position.

 S 715-190
 (19) Do a test of the 250°F duct overheat switch, S6 or S990:
 (a)  
Make sure that the R PACK switch is at OFF.

 (b)  
Remove the screws which hold the switch to the duct.

 (c)  
Remove the switch and its gasket from the duct.

 (d)  
Put a cover in the duct opening to keep out the unwanted materials.

 CAUTION: DO NOT LET THE TEMPERATURE OF THE SWITCH PROBE GET HOTTER
_______ THAN 260°F (127°C). DAMAGE TO THE SWITCH COULD OCCUR.
 (e)  
Use the specified heat source equipment to increase the temperature of the switch probe.

 (f)  
Make sure these lights come on when the switch probe temperature reaches temperature 250|10°F (121|6°C): 1) Right PACK TRIP OFF light on the P5-10 panel 2) MASTER CAUTION and AIR COND annunciator lights

 (g)  
Remove the heat from the switch probe.

 (h)  
Let the switch probe become cool.

 (i)  
Push the TRIP RESET switch on the P5-10 panel.

 (j)  
Make sure that the MASTER CAUTION, AIR COND and the PACK TRIP OFF lights go off.

 (k)  
Remove the cover from the duct opening.

 (l)  
Attach the switch and its gasket to the duct with the screws.

 J. Put the Airplane Back to Its Usual Condition
 S 865-071
 (1)  
Move the RECIRC FAN switch to AUTO, on the P5.10 panel.

 (2)  
Remove the test equipment from the airplane.

 S 085-072
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