ITB20-030

Classification:
Reference:
Date:
AT20-008
ITB20-030
December 23, 2020
2019-2020 QX50; CVT FLUID COOLER HOSE LEAK
APPLIED VEHICLES:
APPLIED VIN:
APPLIED DATE:
2019-2020 QX50 (J55) with tow package
2019 All
2020 Built before 3PCA75M (**) LF121797
Built before July 1, 2020
IF YOU CONFIRM
CVT fluid is leaking from the upper CVT fluid
cooler hose, at the CVT cooler.
Upper CVT fluid cooler
hose leaking or detached
here (shown with vehicle
disassembled)
Or
The upper CVT fluid cooler hose has become
detached while driving.
Figure 1
NOTE: If CVT fluid is leaking from any other location, this bulletin does not apply. Refer to the ESM for
further diagnostic and repair information.
ACTION
Follow the service procedure in this bulletin to replace the upper CVT fluid cooler hose and clamps.

Do NOT follow the procedure in the ESM for CVT fluid cooler hose replacement.

Do NOT reconnect the original upper CVT fluid cooler hose.
IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you will be performing.
You MUST closely follow the entire SERVICE PROCEDURE as it contains information that is essential to
successfully completing this repair.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that
a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti retailer to determine if this
applies to your vehicle.
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SERVICE PROCEDURE
1.
Raise and support the vehicle.
2.
Remove the front under cover bolts and clips and remove the front under cover.
3.
Lower the vehicle.
4.
Remove the Air duct 2 (air inlet duct).
Air duct 2
(Air inlet duct)
Figure 2
5.
Remove the core support cover.
Core support
cover
Figure 3
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ITB20-030
6.
Remove the upper horn.
7.
Disconnect the secondary latch cable from the hood lock assembly.
Hood lock
assembly
Secondary
latch cable
Upper horn
Figure 4
8.
Remove the two (2) upper fascia retainer supports.
Upper fascia
retainer support
Upper fascia
retainer support
Figure 5
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ITB20-030
9.
Disconnect the hood lock assembly connector.
10.
Unclip the wiring harness from the upper fascia retainer.
11.
Remove the secondary latch.
Upper fascia
retainer
Hood lock assembly
connector
Secondary latch
Figure 6
12.
Remove the two (2) distance sensor upper bracket bolts.
Distance sensor
upper bracket bolts
Upper fascia
retainer
Figure 7
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ITB20-030
13.
Remove the washer tank inlet from the washer tank.
Upper fascia
retainer
Washer
tank inlet
Figure 8
14.
Remove the upper fascia retainer.
15.
Remove the upper air guide.
Upper air guide
Upper fascia
retainer
Figure 9
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ITB20-030
16.
Remove the Air guide LH (driver side air guide).
Air guide LH
(Driver side
air guide)
Figure 10
17.
Remove the Air guide RH (passenger side air guide).
Air guide RH
(Passenger
side air
guide)
Figure 11
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ITB20-030
18.
Release the pawls at each top corner of the condenser.

Carefully lift the condenser up at both ends, and pull it slightly away from the radiator on the driver
side.
Upper CVT fluid cooler
hose (shown connected)
Condenser
pulled slightly
away from
radiator
Figure 12
19.
Remove the upper CVT fluid cooler hose from the cooler fitting, if it is not currently detached.

20.
Use a drain pan to catch any CVT fluid that might come out of the cooler hose and fitting.
Disconnect the upper CVT fluid cooler hose from the CVT oil warmer.

Use a drain pan to catch any CVT fluid that might come out of the cooler hose and fitting.
CVT oil
warmer
Figure 13
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ITB20-030
21.
Remove the upper CVT fluid cooler hose from the vehicle.
NOTE: Do not reuse this hose and its related clamps. They will be replaced with those listed in the
PARTS INFORMATION.
22.
23.
Clean the outer surfaces of both the CVT fluid cooler and the CVT oil warmer hose fittings with an
alcohol wipe from the Squeak and Rattle Kit.

“Shop paper” (lint-free towel) and Nissan brake cleaner or equivalent cleaner can be used. Make
sure the cleaner used complies with local regulations.

Always use a lint-free towel. Never use a shop cloth.
Install the new upper CVT fluid cooler hose and route it exactly like the original hose using new clamps.
Upper CVT fluid cooler hose
routing (shown with condenser
removed for clarity)
Figure 14
24.
Reassemble the vehicle in reverse order of disassembly.
25.
Adjust the CVT fluid to the correct level. Refer to the ESM: TRANSMISSION & DRIVELINE >
TRANSAXLE & TRANSMISSION > CVT: GE0F10A > PERIODIC MAINTENANCE > CVT FLUID.
26.
Perform radar alignment. Refer to the ESM: CRUISE CONTROL & DRIVER ASSISTANCE > DRIVER
ASSISTANCE SYSTEM > DRIVER ASSISTANCE SYSTEM > BASIC INSPECTION > ADDITIONAL
SERVICE WHEN REPLACING ICC SENSOR.
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ITB20-030
PARTS INFORMATION
DESCRIPTION
HOSE-OIL COOLER, AUTO TRANSMISSION
(CVT Cooler Hose)
CLAMP-HOSE BAND
(CVT Cooler Hose Clamp)
Nissan NS-3 CVT Fluid (1) (2)
(1)
(2)
PART NUMBER
QUANTITY
21631-5NA0A
1
21639-7990A
2
NS3999MP-CV0NS3
As needed
For warranty repairs, Nissan NS-3 CVT Fluid must be used. For customer pay repairs, Nissan NS-3 CVT
Fluid, or an equivalent, is recommended.
Order this item through the Infiniti Maintenance Advantage program: Phone 877-INF-IMA1 (877-4634621). Website order via link on the dealer portal; www.NNAnet.com and click on the “Maintenance
Advantage-Tire/Battery/Chemical” link.
CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the following claims coding:
(1)
DESCRIPTION
PFP
OP CODE
SYM
DIA
FRT
Replace CVT Oil Cooler Hose
(1)
CX37AA
ZE
32
1.9
Reference the electronic parts catalog and use the A/T Oil Cooler Hose (21631-*****) as the Primary
Failed Part (PFP).
AMENDMENT HISTORY
PUBLISHED DATE
REFERENCE
December 23, 2020
ITB20-030
DESCRIPTION
Original bulletin published
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ITB20-030