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Service bulletin PIT5734F

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10240778
Published by NHTSA2023-08-21
Manufacturer's numberPIT5734F
Manufacturer's date2023-07-05
NHTSA componentVISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM

NHTSA's summary

This Preliminary information communicates an issue with poor heater performance and advises dealerships to inspect the heater core inlet and outlet hoses for being twisted or kinked.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Glass, wipers and mirrors, Heating and air conditioning

Vehicles listed
CADILLAC ESCALADE ESV2021, 2022, 2023
CHEVROLET SILVERADO 15002020, 2021, 2022, 2023 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2021, 2022, 2023
CHEVROLET TAHOE2021, 2022, 2023
GMC SIERRA 15002020, 2021, 2022, 2023 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON XL2021, 2022, 2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
22-NA-1612025-09-27. Service bulletin. This informational bulletin provides information for dealers/technicians on power folding mirrors do not fold at the same speed.
24-NA-1642025-04-15. Service bulletin. This bulletin provides information on Wiper Blade Maintenance Tips.
24-NA-0462025-03-13. Service bulletin. This technical bulletin provides a procedure to correct the condition of Suction Cup Marks on Window Glass.
24-NA-1642025-03-06. Service bulletin. This bulletin provides information on Wiper Blade Maintenance Tips.
PIE08182025-03-06. Service bulletin. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the outside rearview mirror skull cap missing.
21-NA-0432025-02-12. Service bulletin. 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.
23-NA-1672024-12-18. Service bulletin. This informational bulletin provides information on Outside Rear View Mirror Defog or Defrost Times Different for Passenger and Driver Mirrors.
24-NA-1642024-09-25. Service bulletin. This bulletin provides information on Wiper Blade Maintenance Tips.
PI0754G2024-08-17. Service bulletin. This PI provides information on Rear and Side Tempered Glass Spots (Quench Marks) and that they are a normal characteristic.
23-NA-0842024-08-15. Service bulletin. This service bulletin provides repair information to correct a customer concern of a Blue Hourglass and No Gridlines on Radio Rear View Camera Display While in Reverse.