# Service bulletin 20NA028

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: 10205054
- Published by NHTSA: 2021\-12\-20
- Manufacturer's number: 20NA028
- Manufacturer's date: 2021\-08\-27
- NHTSA component: ENGINE AND ENGINE COOLING:COOLING SYSTEM

## NHTSA's summary

This service bulletin is to inform dealers that in extreme cold weather, a grille winter cover needs be added during PDI to avoid the customer returning with concerns related to charge air cooler icing.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205054-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205054-9999.pdf)

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

## Components

Engine, Cooling system

## Vehicles listed

- 2020 to 2022 BUICK ENCORE GX
- 2021 to 2022 CHEVROLET TRAILBLAZER

## Other bulletins for the same vehicles and component

- [21NA257](/bulletins/10205577.md), 2021-12-27, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This service bulletin provides a service procedure to correct a customer concern of a Malfunction Indicator Lamp \(MIL\) Illuminated \- DTC P3075 Set.
- [20NA154](/bulletins/10180314.md), 2020-09-28, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY. This Technical bulletin provides a procedure to correct a customer concern of a Flutter or Boom Noise around 1100 RPM.
- [20NA028](/bulletins/10178966.md), 2020-08-31, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin is to notify dealership personnel as well as providing the customer with the usage instructions from the owner manual, that in extreme cold weather \(\-18°C or less / 0°F or less\), a grille winter cover needs be added during PDI to avoid the customer returning with concerns related to charge air cooler icing.

JSON: [/v1/bulletins/10205054](/v1/bulletins/10205054)

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