NHTSA ID Number: 10130982
Manufacturer Communication Number: IK1900226
TSB/Document Date: 2018-04-02
Summary
Air Conditioning Control Head Diagnostics
modes and temperature.
No: Go to step 10.
Do all modes work correctly?
10
Blend Door Actuator Signal
Decision
A. Disconnect harness connector from blend door actuator.
Yes: Go to step 12.
B. Turn the ignition Key-On.
C. Turn the A/C blowerON.
No: Go to step 11.
D. Set HVAC selector to A/C MAX Mode.
E. Connect a test light between harness Pin-A and Pin-B.
F. Move temperature switch through ALL settings while observing the test light.
Does the test light illuminate in all switch positions?
(If using a DMM, Pin-A to Pin-B spec is 12V +/- 1.5)
11
Blend Door Actuator Circuits
A. Inspect circuit A74B (connector 1200 Pin-B11, to connector
2010 PinC, to blend door actuator PinB).
B. Inspect circuit A74C (connector 1200 Pin-B12, to connector
2010 PinD, to blend door actuator PinA).
Are circuits open or shorted?
Decision
Yes: Repair as needed. After
repairs are complete,
reassemble unit and retest for
operator concern.
No: Replace control head.
Reassemble unit and retest
for operator concern.
…….
12
Blend Door Movement
A. Remove blend door actuator from interior module. Connect
the harness connector to the actuator.
B. Turn the ignition Key-ON.
C. Turn the blowerON.
D. Set HVAC selector to A/C MAX Mode.
E. Move temperature switch through ALL settings while
observing the actuator movement.
F. Move the blend door by hand through its full range of
movement.
Does both the actuator respond to the control head signals
and thedoor move freely?
Decision
Yes: Reinstall blend door
actuator, plug in harness
connector, and then go to
step 13.
No: door binds or sticks:
disassemble interior module
and repair as needed.
After repairs are complete,
reassemble unit and retest for
operator concern.
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IK1900226 Air Conditioning Control Head Diagnostics
Page 6 of 9
No, actuator does not
function: replace actuator.
Reassemble unit and retest
for operator concern.
……..
13 Heater Core Sealing
A. Reassemble A/C system to operate.
B. Use hose pinch off pliers the close off both heater
hoses in engine compartment.
C. Start the engine and raise the idle speed to 1500
rpm.
D. Turn HVAC control switch to NORM.
E. Turn Blower to highest speed and Temperature
Control to coldest temp
F. Insert thermometer into left side passenger dash vent.
Do not allow thermometer to touch duct.
G. Open windows and close both cab doors.
H. After cab temperature stabilizes, record temperature.
I. Remove both pair of pinch-off pliers.
Is duct temperature correct until pliers are removed?
Decision
Yes: (NoteIf vehicle has a manual
coolant shut-off valve in the heater
core circuit, verify it is in the off
position.)
Check Sealing around heater core
for placement. Remove blower
scroll housing, and heater core if
required, to reposition seal around
heater core.
After repairs are complete,
reassemble unit and retest for
operator concern.
No: System is working correctly.
Reassemble unit and retest for
operator concern.
…………..
Step 14-17: Mode Control Diagnostics
14
Door Recalibration
A. Turn the ignition Key-On.
B. Turn the blower ON.
C. Set HVAC selector to Defrost Mode.
D. Remove the fuse box cover. Remove the 5 Amp fuse from
Battery to HVAC Control Head (ProStar position is F1-B).
E. Wait approximately 30 seconds then reinstall the fuse.
F. You should hear the doors recalibrate by moving from one
extreme position to the other.
Decision
Yes: Mode control operates
correctly.
Note-Do not operate the control head during the recalibration.
No: Go to step 15.
G. Start vehicle and check for correct operation of all modes
and temperature.
Do all modes work correctly?
……..
15
Mode Door Actuator Signal
A. Disconnect harness connector from mode door actuator.
B. Turn ignition Key-On.
C. Turn blower ON
D. Set HVAC selector to A/C MAX Mode.
E. Connect a test light between harness Pin-A and Pin-B.
F. Move mode switch through ALL settings while observing
the test light.
Decision
Yes: Go to step 17.
No: Go to step 16.
Does the test light illuminate in all switch positions?
(If using a DMM, pin-A to Pin-B spec is 12V +/- 1.5)
……
16
Mode Door Actuator Circuits
A. Inspect circuit A74 (connector 1200 Pin-B9 to connector
2010 Pin-A to mode actuator Pin-B).
Decision
Yes: Repair as needed. After
repairs are complete,
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IK1900226 Air Conditioning Control Head Diagnostics
B. Inspect circuit A74A (connector 1200 Pin-B10 to
connector 2010 PinB to mode actuator PinA).
Are circuits open or shorted?
Page 7 of 9
reassemble unit and retest for
operator concern.
No: Replace control head.
Reassemble unit and retest for
operator concern.
……
17
Mode Door Movement
A. Remove mode door actuator from interior module. Connect
the harness connector to the actuator.
B. Turn ignition Key-On.
C. Turn blower ON.
D. Move mode switch through ALL settings while observing
the actuator movement.
E. Move the mode door by hand through its full range of
movement.
Does both the actuator respond to the control head signals
and thedoor move freely?
Decision
Yes: system is functioning
correctly.
No: door binds or sticks:
repair interior module as
needed. After repairs are
complete, reassemble unit
and retest for operator
concern.
No: actuator does not
function: Replace actuator.
Reassemble unit and retest
for operator concern.
……………
Step 1821: Recirculation Door Diagnostics
18
Door Recalibration
A. Turn ignition Key-On.
B. Turn blower ON.
C. Set HVAC selector to Defrost Mode.
D. Remove the fuse box cover. Remove the 5 Amp fuse from
Battery to HVAC Control Head (ProStar position is F1-B).
E. Wait approximately 30 seconds then reinstall the fuse.
F. You should hear the doors recalibrate by moving from one
extreme position to the other.
Decision
Yes: Recirculation Door
operates correctly.
Reassemble unit and retest
for operator concern.
Note - Do not operate the control head during the
recalibration.
G. Start vehicle and check for correct operation of all modes
and temperature.
No: Go to step 19.
Do all modes work correctly?
………….
19
Recirculation Door Actuator Signal
A. Disconnect harness connector from recirculation door
actuator.
B. Turn ignition Key-On.
C. Turn blower ON.
D. Set HVAC selector to A/C MAX Mode.
E. Insert a test light between Pin-A and Pin-B of the
recirculation door harness.
F. Move mode switch from MAX to NORM.
Decision
Yes: Leave recirculation door
actuator harness unplugged
and go to step 21.
No: Leave recirculation door
actuator harness unplugged
and go to step 20.
Does test light illuminate brightly in MAX?
(If using a DMM, pin-A to Pin-B spec is 12V +/- 1.5)
…….
20
Recirculation Door Actuator Circuits
A. Inspect circuit A74D (connector 1200 Pin-B1 to connector
2010 Pin-E to mode actuator Pin-A).
Decision
Yes: Repair as needed.
Reassemble unit and retest
for operator concern.
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IK1900226 Air Conditioning Control Head Diagnostics
B. Inspect circuit A74E (connector 1200 Pin-B2 to connector
2010 Pin-F to mode actuator Pin-F).
Are circuits open or shorted?
Page 8 of 9
No: Replace control head.
Reassemble unit and retest
for operator concern.
……..
21
Recirculation Door Actuator Movement
A. Remove recirculation door actuator from interior module.
Connect the harness connector to the actuator.
B. Turn ignition Key-ON.
C. Turn blower ON.
D. Move mode switch from NORM to MAX A/C while
observing the actuator movement.
E. Move the recirculation door by hand through its full range of
movement.
Decision
Yes: Recirculation door is
functioning correctly.
Does both the actuator respond to the control head signals
and thedoor move freely?
No, Actuator does not
function: replace actuator.
Reassemble unit and retest
for operator concern.
No, Door binds or sticks:
repair interior module as
needed. Reassemble unit and
retest for operator concern.
…….
Step 22: Control Head Power
22
Control Head Power
A. Turn ignition Key-ON.
B. Connect a 12V test light between a good ground and
Pin-A1 of the A/C control head harness connector (1200).
C. Wiggle 10A fuse F4-L while watching test light to check
for loose/ intermittent fuse connection.
D. Connect a 12V test light between Pin-A1 and B6 of the
1200 connector and monitor test light.
E. Connect a 12V test light between a good ground and
Pin-A2 of the A/C control head harness connector (1200).
F. Wiggle 5A fuse F1-B while watching test light to check
for loose/ intermittent fuse connection.
G. Connect a 12V test light between Pin-A2 and B6 of the
1200 connector and monitor test light
Which of the following steps does not illuminate the test
light brightly: Step C, D, F, or G?
Decision
Step C does not illuminate
the test light brightly: If 10A
HVAC fuse is good, check
circuit A73A for open or
high resistance.
After repairs are complete,
reassemble unit and retest
for operator concern.
Step D does not illuminate
the test light
brightly: Check circuit
A74G and A11GCA for
open or high resistance
(Connector 1200 Pin-B6 to
Left Side Dash Mounted
Dual Post GND Plate).
After repairs are complete,
reassemble unit and retest
for operator concern.
Step F does not illuminate
the test light brightly: If 5A
HVAC fuse is good, check
circuit A75D for open or
high resistance.
After repairs are complete,
reassemble unit and retest
for operator concern.
Step G does not illuminate
the test light brightly:
Check circuit A74G and
A11-GCA for open or high
resistance
(Connector 1200 PinB6 to
Left Side Dash Mounted
Dual Post GND Plate).
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IK1900226 Air Conditioning Control Head Diagnostics
Page 9 of 9
After repairs are complete,
reassemble unit and retest
for operator concern.
………
WARRANTY INFORMATION
NOTE: There are multiple noun groups that the diagnostic time could be charged to.
Warranty Claim Coding:
Group: 1900 - Truck Air Conditioner
Noun: Multiple Nouns - Code to repair made
Warranty Coding Manual
Standard Repair Times:
DIAGNOSTICS
Step
123
Description
SRT Link
Hours
INSPECTION/PERFORMANCE DIAGNOSTICS
A19‐7006A
1.0
Link to the Standard Repair Time Manual: Click Here
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Copyright © 2014 Navistar
, Inc.
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TSB/Document ID: IK1900226
Replacement Service Bulletin Number:
MFR Communication Date: 2014-10-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:APPLIANCE:AIR CONDITIONER
MFR Component System:
MFR Component Subsystem:
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