2017-2020 MCI J4500 Motor Coaches SB486 Coolant Hoses Replacement

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August 31, 2020 NHTSA CAMPAIGN NUMBER: 20V526000

Coolant Hose May Fail

The spilled coolant may increase the risk of a crash. Additionally, transferring passengers from the disabled bus can increase their risk of injury.

 

NHTSA Campaign Number: 20V526

Manufacturer Motor Coach Industries

Components ENGINE AND ENGINE COOLING

Potential Number of Units Affected 1,561

 

Summary

Motor Coach Industries (MCI) is recalling certain 2017-2020 J4500 motor coaches. The coolant hose may fail, resulting in a low coolant warning followed by an engine shut down sequence, as well as the potential for engine coolant spilling on the roadway.

 

Remedy

MCI will notify owners, and dealers will replace the coolant hose, free of charge. The recall began October 30, 2020. Owners may contact MCI customer service at 1-800-241-2947. MCI’s number for this recall is SB 486.

 

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

 


Customer complaint:

Motor Coach Industries (MCI) has become aware that on certain J4500 coaches, the coolant hose elbows supplied by Purosil LLC are failing prematurely.

 

Cause:

The coolant hoses supplied by Purosil LLC have poor build quality.

 

Corrective action:

MCI recommends owners of the affected coaches have the following procedure performed to replace the coolant hose elbows and clamps supplied by an alternative vendor.

 



4 Affected Products

Vehicle

MAKE MODEL YEAR
MCI J4500 2017-2020

 


9 Associated Documents

Recall Quarterly Report #3, 2021-2

RCLQRT-20V526-8383.PDF 211.315KB

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Recall Quarterly Report #1, 2020-4

RCLQRT-20V526-8091.PDF 211.126KB

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Recall 573 Report- Amendment 1

RCLRPT-20V526-1141.PDF 214.406KB

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Owner Notification Letter(Part 577)

RCONL-20V526-7250.pdf 875.571KB

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Recall Quarterly Report #2, 2021-1

RCLQRT-20V526-2601.PDF 211.224KB

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Defect Notice 573 Report

RCLRPT-20V526-2816.PDF 216.449KB

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Remedy Instructions and TSB

RCRIT-20V526-2554.pdf 1332.668KB

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Recall Acknowledgement

RCAK-20V526-6006.pdf 244.826KB

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Recall Quarterly Report #4, 2021-3

RCLQRT-20V526-7279.PDF 211.415KB

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Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V526&docType=RCL

 


1 Associated Investigation

Heater hose rupture
NHTSA ID: PE20001
Dated opened: March 13, 2020

An Office of Defects Investigation (ODI) review of Early Warning Reporting (EWR) submissions by Motor Coach Industries (MCI) on model year (MY) 2017-2019 J4500 buses identified ruptured heater hoses on multiple motor coaches leading to the vehicles becoming disabled. ODI follow up with fleets found that a low coolant level light with an audible warning would provide notice to the bus driver to pull off the roadway before the bus shut down to prevent catastrophic engine damage. According to the fleets interviewed, there is not enough time between the warning and the engine shutting down to allow the driver to pull to a safe location. Multiple reports/interviews describe buses requiring passenger transfer to a second bus at roadside.

Discussions with MCI identified the heater hoses as being problematic with a high failure rate. During fleet interviews and additional field report searches, it was found that, in addition to the heater hoses failing, the radiator could also potentially crack resulting in most of the 25 gallons of coolant to be lost. In both failure scenarios, enough coolant can be lost to cause the engine to shut down quickly and prevent the driver from moving to a safe location before having to transfer the passengers to a second vehicle. This can compromise the safety of vehicle occupants and other moving vehicles.

A Preliminary Evaluation has been opened to determine if a defect in the subject vehicle presents an unreasonable risk to vehicle occupants and other moving vehicles on the road.


 

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