# Service bulletin PIT5221

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: 10113174
- Published by NHTSA: 2017\-08\-15
- Manufacturer's number: PIT5221
- Manufacturer's date: 2013\-08\-02
- NHTSA component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM

## NHTSA's summary

This Preliminary Information communication provides information to the technician about vehicles that intermittently after selecting defrost mode they are unable to manually adjust the blower speed lower. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2013/MC-10113174-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2013/MC-10113174-0001.pdf)

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

## Components

Glass, wipers and mirrors, Heating and air conditioning

## Vehicles listed

- 2014 CHEVROLET SILVERADO 1500
- 2014 GMC SIERRA 1500

## Other bulletins for the same vehicles and component

- [21\-NA\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold \(prepping\) to the customer.
- [PI0754G](/bulletins/11006511.md), 2024-08-17, Service bulletin: VISIBILITY/WIPER. This PI provides information on Rear and Side Tempered Glass Spots \(Quench Marks\) and that they are a normal characteristic.
- [PIT5387B](/bulletins/10252173.md), 2024-04-01, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; ELECTRICAL SYSTEM. Radio HVAC IPC Blank Out When Operating A Snow Plow.
- [PIT5347](/bulletins/10252157.md), 2024-04-01, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. Sunroof Reverses When Closing At Highway Speeds.
- [990139004E](/bulletins/10250080.md), 2024-02-12, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. Air Conditioning Odor
- [PIT5293](/bulletins/10248471.md), 2024-01-08, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. Unwanted A/C Compressor Operation After Being Turn Off \(Normal Operation.
- [PIT5099G](/bulletins/10247780.md), 2023-12-26, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater\-Vent\-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
- [PIT5099A](/bulletins/10247063.md), 2023-12-11, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. A/C Blows Warm Or Poor Performance.
- [130089004H](/bulletins/10246623.md), 2023-12-11, Service bulletin: VISIBILITY:WINDSHIELD; UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE; EXTERIOR LIGHTING:LIGHTING CONTROL MODULE; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; VEHICLE SPEED CONTROL:THROTTLE:THROTTLE POSITION SENSOR \(TPS\). Car and Truck Fix it Right the First Time Issues
- [990139004E](/bulletins/10246567.md), 2023-12-11, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. Air Conditioning Odor

JSON: [/v1/bulletins/10113174](/v1/bulletins/10113174)

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