NHTSA ID Number: 11030636
Manufacturer Communication Number: SA-014-26
TSB/Document Date: 2026-04-02
Summary
This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant leak from the bleed hole. This Service Alert is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not. A mechanical seal (A) is used for the water pump. This mechanical seal can seal coolant (B) by sliding a mating ring (C) against a seal ring (D). When the sliding surface temperature of the mechanical seal is more than 248 °F (120 °C) while driving, a small amount of steam (E) is leaked and bleeds through the bleeding hole (F). After drying, the steam leaves a green coolant deposit near the water pump bleed hole (F). This is a normal condition and does not require water pump replacement. The water pump should only be replaced if there is an accumulation of crystallized coolant near the bleed hole. When you encounter a water pump with coolant seepage marks, decide to replace it or not based on the following criteria using sample photos. NOTE: During the initial period of use*, the sliding surfaces of the seals may not yet be fully settled, which can temporarily increase the amount of leakage. Continued use will allow the surfaces to settle, reducing the leakage. Replacing parts that are already settled with new ones will increase the leakage again until the new parts become conditioned. Therefore, replacement should be avoided in this initial period of use. *As a guideline, this applies to vehicles with less than 1,860 miles (3000 km) of mileage.
BULLETIN NOTES
This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red.
Previous SA(s):
Date(s) Issued:
Previous TSB(s):
Date(s) Issued:
SA-035/24
05/31/24
01-022/19
12/13/19
SA-081/23
12/05/23
01-016/16
08/26/16
01-004/09
02/03/09
APPLICABLE MODEL(S)/VINS
2018-2026 Mazda3
2018-2026 CX-5
2020-2026 CX-30
2018-2021 Mazda6
2018-2023 CX-9
2023-2026 CX-50 (All)
2018-2021 CX-3
2018-2024 MX-5
2024-2026 CX-90 (All)
2025-2026 CX-70 (All)
DESCRIPTION
There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant
leak from the bleed hole. This Service Alert is to inform you about the water pump sealing mechanism and the criteria if
replacement is necessary or not.
Normal Water Pump Coolant Seepage
Page 1 of 7
03/12/2026 01:20 PM tlawrenc
A mechanical seal (A) is used for the water pump. This mechanical seal can seal coolant (B) by sliding a mating ring (C)
against a seal ring (D). When the sliding surface temperature of the mechanical seal is more than 248 °F (120 °C) while
driving, a small amount of steam (E) is leaked and bleeds through the bleeding hole (F). After drying, the steam leaves a
green coolant deposit near the water pump bleed hole (F). This is a normal condition and does not require water pump
replacement. The water pump should only be replaced if there is an accumulation of crystallized coolant near the bleed
hole.
When you encounter a water pump with coolant seepage marks, decide to replace it or not based on the following criteria
using sample photos.
NOTE: During the initial period of use*, the sliding surfaces of the seals may not yet be fully settled, which can
temporarily increase the amount of leakage. Continued use will allow the surfaces to settle, reducing the leakage.
Replacing parts that are already settled with new ones will increase the leakage again until the new parts become
conditioned. Therefore, replacement should be avoided in this initial period of use.
*As a guideline, this applies to vehicles with less than 1,860 miles (3000 km) of mileage.
Page 2 of 7
03/12/2026 01:20 PM tlawrenc
Bleed hole (F) is located under water pump
Dried coolant steam shows as green-color deposit at bleed
hole
Water Pump Samples:
GOOD
NO GOOD
No accumulation of crystallized coolant near the bleed hole Accumulation of crystallized coolant near the bleed hole (F)
(F).
.
DO NOT replace the water pump.
REPLACE the water pump.
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03/12/2026 01:20 PM tlawrenc
Drips on Undercover:
Even with a normal level of leakage, drips may fall onto the undercover. If drips are observed on the undercover, wipe
them off.
Mileage under 1,860 miles (3,000 km):
• If the leakage amount is at the level shown in the figure below, replacement is not necessary.
Page 4 of 7
03/12/2026 01:20 PM tlawrenc
Mileage over 1,860 miles (3,000 km):
• If the leakage amount is at the level shown in the figure below and the coolant is dry, replacement of the water
pump is not necessary. Sample at 31,070 miles (50,000 km).
Page 5 of 7
03/12/2026 01:20 PM tlawrenc
NOTE:
• Regarding the following engines, diagnose whether the water pump requires replacement as with the other
engines in this service information.
• Refer to the following images regarding the location of the bleeding hole (white dotted circle).
SKYACTIV-G 2.5 (PYUL)
SKYACTIV-G 3.3 (H3T)
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03/12/2026 01:20 PM tlawrenc
REPAIR PROCEDURE
1. Verify customer concern.
2. Verify repair.
Page 7 of 7
03/12/2026 01:20 PM tlawrenc
- Formulated to replace the OEM fluid in Asian make vehicles...
- 5 year/150, 000 mile . Silicate-free, long-life, phosphate...
- The long life formula provides protection for all cooling...
- Meets the following OEM and industry specifications: JIS K...
- Note: Please check the vehicle specification before...
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TSB/Document ID: SA-014-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem: Water Pump
Previous TSB | Next TSB |
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