# Service bulletin SB54\-338

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: 10184869
- Published by NHTSA: 2020\-12\-30
- Manufacturer's number: SB54\-338
- Manufacturer's date: 2020\-12\-29
- NHTSA component: VISIBILITY; EQUIPMENT

## NHTSA's summary

Freightliner Service Bulletin for Front HVAC Evaporator Freezing and Espar Heater Cool Down Algorithm. New Cascadia vehicles with sleeper cabs may become extremely cold when in A/C mode, which can lead to reduced airflow as a result of internal ice buildup at the evaporator. Durability of the Espar D5 heater system when paired with the battery parked HVAC system \(BPHS\) can be improved by applying "cool down" software to the parked control unit \(PCU\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184869-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184869-9999.pdf)

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

## Components

Equipment and accessories, Glass, wipers and mirrors

## Vehicles listed

- 2017 to 2021 FREIGHTLINER CASCADIA

## Recalls for the same vehicles and component

- [2024745](/recalls/tc/2024745.md), 2024-12-10: Visual System
- [22V338000](/recalls/nhtsa/22V338000.md), 2022-05-16: EQUIPMENT:OTHER:LABELS
- [2018387](/recalls/tc/2018387.md), 2018-07-23: Visual System
- [17V810000](/recalls/nhtsa/17V810000.md), 2017-12-15: EQUIPMENT
- [17V452000](/recalls/nhtsa/17V452000.md), 2017-07-17: EQUIPMENT

## Other bulletins for the same vehicles and component

- [SS3076\-FTL](/bulletins/11024972.md), 2025-11-05, Other: VISIBILITY/WIPER. Service Solution for P4 Main Mirror Arm Covers Loose \- Falling Off
- [SS3142\-FTL](/bulletins/11011107.md), 2024-12-04, Other: LANE DEPARTURE: BLIND SPOT DETECTION; ENGINE; VISIBILITY/WIPER. Service Solution for J1939 CAN issues for vehicles equipped w/ Bendix Side Radar w/ expanded field of view
- [MYCOM\_07192024\-2](/bulletins/11005472.md), 2024-08-02, Other: VISIBILITY/WIPER. My Communications for New Espar HS3 Heater and Extreme Insulation
- [SF673](/bulletins/10252334.md), 2024-04-02, Service bulletin: EQUIPMENT. Field Service Campaign for Common Telematics Platform \(CTP\) Installation and Initialization
- [SF672\_V4](/bulletins/10246175.md), 2023-12-06, Service bulletin: ELECTRICAL SYSTEM; EQUIPMENT. Revised Field Service Campaign for Common Telematics Platform Software Update
- [SB60\-178](/bulletins/10244759.md), 2023-11-03, Service bulletin: EQUIPMENT. Service Bulletin for Relocating the Bluetooth Microphone
- [SB54\-338](/bulletins/10240131.md), 2023-08-05, Service bulletin: VISIBILITY. Revised Service Bulletin for Updating HVAC ECU Software to Fix Front HVAC Evaporator Freezing and Improve Espar Heater Cool Down. Description of Revisions: This bulletin replaces the version dated December 2021. The general information and warranty information has been updated.
- [SF672](/bulletins/10238260.md), 2023-06-29, Service bulletin: ELECTRICAL SYSTEM; EQUIPMENT. Field Service Campaign for Common Telematics Platform Software Update
- [SF662\_V2](/bulletins/10235647.md), 2023-05-05, Service bulletin: EQUIPMENT. Revised Freightliner Field Service Campaign for TomTom Android Black Box Update
- [SB54\-358](/bulletins/10235642.md), 2023-05-05, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM. Revised Freightliner Service Bulletin for Converting CTP1 to CTP2. Description of Revisions: This bulletin replaces the version dated 11/28/2022. The CTP replacement part number has been updated.

JSON: [/v1/bulletins/10184869](/v1/bulletins/10184869)

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