2010 - 2021 Cadillac ATS-V CTS-V CT5-V CT6-V: #21-NA-108: Information on Engine Overheating, Cooling System Contaminated with Engine Oil - (May 4, 2021)

#21-NA-108: Information on Engine Overheating, Cooling System Contaminated with Engine Oil - (May 4, 2021)

Subject:  Information on Engine Overheating, Cooling System Contaminated with Engine Oil

This bulletin replaces PIP5257E. Please discard PIP5257E.

Brand:

Model:

Model Year:

VIN:

Engine:

(3.0L or 3.6L)

Transmission:

from

to

from

to

Buick

Allure

2010

2016

—

—

LF1, LFW, LFX, LLT

—

Enclave

2021

LFY, LLT

LaCrosse

2019

LF1, LFW, LFX, LGX

Cadillac

ATS

2013

2019

LF4, LFX, LGX

CT5

2020

2021

LGY

CT6

2016

2021

LGW, LGX

CTS

2010

2019

LFW, LF3, LFX, LGX

SRX

2010

2016

LFX, LFW

XT5

2017

2021

LGX

XT6

2020

2021

LGX

XTS

2013

2019

LF3, LFX

Chevrolet

Blazer

2019

2021

LGX

Camaro

2010

2021

LFX, LGX

Caprice

2012

2017

LFX

Captiva

2011

2018

LFW, LFX

Colorado

2015

2021

LFX, LGZ

Equinox

2010

2017

LF1, LFW, LFX

Impala

2012

2020

LFX

Traverse

2010

2021

LFY, LLT

GMC

Acadia

2010

2021

LGX, LLT

Canyon

2015

2021

LFX, LGZ

Terrain

2010

2016

LF1, LFW, LFX

 

Involved Region or Country

North America, Europe, Russia, Middle East, Iraq, Brazil, Chile, Colombia, Ecuador, Paraguay, Uruguay, Venezuela, Japan, GM Korea Company, Cadillac Korea (South Korea), China, Taiwan, Singapore, Australia/New Zealand, Other Africa

Condition

Some customers may comment that the engine is overheating.

Some customers may also comment on one or more of the following conditions:

  • Oil in the coolant overflow reservoir
  • Coolant discharging from the coolant reservoir

Cause

This condition may be caused by a leakage from the main oil gallery to a water jacket through block porosity or thin wall casting.

  • A very thick oil in coolant mix in the radiator and coolant overflow reservoir may be found.
  • The average oil pressure is over 414 kPa (60 psi) and the coolant pressure is 110 kPa (16 psi).

Correction

If a vehicle with this concern has been verified:

  • if equipped, test the oil cooler system for possible leaking into the coolant through the radiator. If the oil cooler tests good, or the vehicle is not equipped with an oil cooler, then reference this bulletin and replace the engine as well as all rubber coolant hoses.
  • If possible, flush the radiator and heater core. Only replace those as needed.
  • if equipped, flush the rear heater core and replace hoses. Only replace those as needed.

Service Procedure

Note: Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

Refer to Engine Replace in SI.

Version

1

Modified

Released May 04, 2021

Article ID: 64
Created: May 5, 2021
Last Updated: May 5, 2021
Author: Rob

Online URL: https://www.cadillacvnet.com/knowledge-base/article/2010-2021-cadillac-ats-v-cts-v-ct5-v-ct6-v-21-na-108-information-on-engine-overheating-cooling-system-contaminated-with-engine-oil-may-4-2021-64.html