SERVICE BULLETIN
M1640

2024-05-07

M1640: COOLING SYSTEM ENHANCEMENT FOR 2024 CENTER COOLED TOURING
MODELS
Table 2. Earlier Models Cooling System Part Numbers

Reason for Revision

Earlier Part No.
62800073
26900326
26900327

Refer to Table 1.
Table 1. Document History
Date
Rev
Revision (Rev) Description
2024-05-07 - Initial release

Table 3. Later Models Cooling System Part Numbers
Later Part No.
26800266
12700198
26900350
10800212
26900301

Purpose for Service Bulletin
This bulletin inform dealers that starting on April 30, 2024, all
Center-Cooled touring vehicles will be assembled with new
components, engineered to help improve a service bleed of the
cooling system.
• Before March 12, 2024 all vehicles were built with the early
system.

• After April 30, 2024 all vehicles were built with the late
design.

NO

Vehicles Affected
2024: Street Glide (FLHX), Road Glide (FLTRX), CVO Street
Glide (FLHXSE), CVO Road Glide (FLTRXSE), CVO Road
Glide ST (FLTRXSTSE)

All markets affected.

YES

Resolution
Actionable:
Any vehicle, component or software related issues
must be performed according to the service bulletin
procedure.

Early parts will continue to be supplied, continue to use early
parts on early vehicles Table 2.
See Figure 1 and Figure 2. How to identify the changes in the
parts:
• The radiator outlet fitting location was changed from low to
high.
• The coolant pump bracket was changed to lower the overall
pump position.
This improves the servicing and helps any air pockets that could
be trapped at the inlet of the coolant pump to move upward into
the radiator.
• The coolant hose that goes from the coolant pump to the
rear head inlet has different geometry and has removed the
union fitting from the center.

Part Numbers
Refer to Table 2.
Table 2. Earlier Models Cooling System Part Numbers
Earlier Part No.
12700183
26800227
26900304

Item Description
Radiator
Bracket coolant pump
Hose coolant radiator outlet
Oetiker clamps
Hose, rear head inlet

Table 4.
Action
Required

The components used in Early Models are listed in Table 2.
The components used in Later Models are listed in Table 3.
These parts will be listed separately in the parts catalog labeled
as Early and Later models with an applicable date noted. Do
not mix the components used in Early and Later Models. They
are not interchangeable. Should Early Model components
become unavailable in the future, see the Parts Catalog and
Parts Price File for super session information.

Qty
1
1
1
4
1

Required Dealer Action

• From March 12, 2024 to April 30, 2024 vehicles were built
with early and late system designs.

Markets Affected

Item Description
Fitting barbed hose union
Hose pump outlet
Hose, rear head inlet

• These differences should help identify if an early system has
been retrofitted to the new parts. Service parts normally,
look up the part and replace with the same part.

Item Description
Bracket coolant pump
Radiator
Hose coolant, radiator outlet

NOTE
In the interest of preserving customer safety and satisfaction, always check for outstanding recalls whenever any motorcycle is brought into your dealership for either maintenance or service.
ROUTING

INITIAL HERE

SERVICE
MANAGER

SALES MANAGER PARTS MANAGER

WARRANTY
PROCESS
MANAGER

LEAD TECHNICIAN TECHNICIAN NO. 1 TECHNICIAN NO. 2 TECHNICIAN NO. 3 RETURN THIS TO

1902563

1
2

3
5

4
1.
2.
3.
4.
5.
6.

6

Radiator
Bracket, coolant pump
Hose, coolant, radiator outlet
Hose, pump outlet
Fitting, barbed union
Hose, read head inlet
Figure 1. Original Coolant Pump

1902564

1

2

3
1.
2.
3.
4.

2/2

4

Radiator
Bracket, coolant pump
Hose, coolant, radiator outlet
Hose, read head inlet
Figure 2. Updated Coolant Pump

M1640