# Service bulletin Z33Revision1

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: 10220763
- Published by NHTSA: 2022\-09\-26
- Manufacturer's number: Z33Revision1
- Manufacturer's date: 2022\-03\-18
- NHTSA component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:COMPRESSOR:MODULE \(ACCM\)

## NHTSA's summary

Customer Satisfaction Notification Z33 Heating Ventilation AC Module

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10220763-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10220763-9999.pdf)

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

## Components

Glass, wipers and mirrors, Heating and air conditioning, A/C compressor

## Vehicles listed

- 2021 JEEP GRAND CHEROKEE
- 2022 JEEP GRAND CHEROKEE 4XE

## Other bulletins for the same vehicles and component

- [0804322REVA](/bulletins/10220791.md), 2022-09-26, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:COMPRESSOR:MODULE \(ACCM\). Flash: Heating Ventilation and Air Conditioning \(HVAC\) Updates This bulletin involves reprogramming the HVAC module with the latest available software. Customers may experience the following:High pitch whistle coming from the dash when the blower motor is turned on.High pitch whistle originated from the defroster door when the HVAC unit in either Hi\-Level \(panel and defrost\) or Bi\-Level \(panel and floor\) modes. May be worsened when running the front airflow at blower bar 1\-2 and rear airflow at blower bar 5\-7.

JSON: [/v1/bulletins/10220763](/v1/bulletins/10220763)

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