# Service bulletin 18NA006

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10139245
- Published by NHTSA: 2018\-06\-04
- Manufacturer's number: 18NA006
- Manufacturer's date: 2018\-01\-25
- NHTSA component: ENGINE AND ENGINE COOLING:COOLING SYSTEM; ENGINE AND ENGINE COOLING

## NHTSA's summary

The technical bulletin provides a procedure for inspecting and performing a cooling system purge if the cooling system has been found low on coolant.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10139245-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10139245-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Cooling system

## Vehicles listed

- 2017 CHEVROLET SILVERADO
- 2018 CHEVROLET SILVERADO 2500
- 2017 GMC SIERRA
- 2018 GMC SIERRA 2500
- 2018 GMC SIERRA DENALI

## Other bulletins for the same vehicles and component

- [22NA013](/bulletins/10212629.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM. This technical bulletin provides a procedure for the technician to check and tighten the CAC plumbing if found loose.
- [20NA166](/bulletins/10212560.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. This informational bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.
- [18NA103](/bulletins/10183153.md), 2020-11-30, Service bulletin: FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP. This service bulletin provides information to correct a customer concern of an in\-tank fuel pump whining noise, engine hard to start and/or stalls and Malfunction Indicator Lamp \(MIL\) is illuminated.
- [PIP5684B](/bulletins/10178370.md), 2020-08-10, Service bulletin: ENGINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT. This Preliminary information communicates the use of air leak diagnostic test tool CH\-52250 in addition to the information found in the service manual.
- [20NA010](/bulletins/10176620.md), 2020-06-22, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. This technical bulletin provides a procedure to replace the cooling fan if found contacting the shroud causing the customers concern.
- [19NA104](/bulletins/10163237.md), 2019-07-29, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY. This informational bulletin provides information for dealers/technicians and customers on steam/vapor coming from the front grille or radiator area.
- [PIP5468F](/bulletins/10144452.md), 2018-09-17, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM; ENGINE; ENGINE AND ENGINE COOLING. This Preliminary Information communication provides information to the technician about vehicles that have a check engine light on. Technician may find Diagnostic Trouble Codes P0101, P0299, P0712, P11CC, P11DC, P2002, P2463, P2627, P2A00, P2459, P22B6, P200C, P200E, P0263, P0266, P0269, P0272, P0275, P0278, P0281 and/or P0284. Technician will need to follow publish Service Information diagnostics first. If Service Information diagnostics do not isolate a root cause of the concern the technician should check for loose or leaking charged air cooler ductwork.

JSON: [/v1/bulletins/10139245](/v1/bulletins/10139245)

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