Service bulletin 14588C

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)
Type	Service bulletin
NHTSA id	10247220
Published by NHTSA	2023-12-18
Manufacturer's number	14588C
Manufacturer's date	2016-06-06
NHTSA component	UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

NHTSA's summary

Engine Cooling Fan Motor

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

Engine, Cooling fan, Cooling system

Vehicles listed
CHEVROLET CAPRICE	2011 to 2015
CHEVROLET IMPALA	2012, 2013, 2014, 2015, 2016

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
PIP5684B	2020-08-10. Service bulletin. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
19NA104	2019-07-29. Service bulletin. This informational bulletin provides information for dealers/technicians and customers on steam/vapor coming from the front grille or radiator area.
PIP5257B	2018-08-20. Service bulletin. This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses.
PIE0385B	2018-05-21. Service bulletin. This engineering information bulletin ends the need for information from the field on vehicles that have the concern of a noisy water pump.
15-NA-053	2018-05-21. Service bulletin. This technical bulletin provides a procedure for installing fan guards on both driver and passenger seat cooling fans due to the ventilation fans coming into contact with the seat cushion pad causing a noise when in use.
PI1203	2018-05-21. Service bulletin. This preliminary bulletin provides information of a normal condition of steam coming from the front grill area after the front gets wet and then heats up from the engine components.
PIP5549	2018-02-21. Service bulletin. This Preliminary information communicates a diagnostic trail to a likely conclusion for lean codes on these vehicles.
PIP4957B	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a Hoot, Gurgle, Howl, or Swoosh noise from the engine cooling system. Technician will need to replace the thermostat housing with the correct part number.
PIP4959C	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician with information about vehicles that misfires or roughness on cold start up. Technician may find Diagnostic Trouble Code P0300 set. Technician will need to add coolant dye to the system and run the engine through warm up to circulate the dye. Pressurize the cooling system after a cold soak and inspect the cylinder with a bore scope for coolant dye. If coolant is found in the cylinder technician will need to contact General Motors Product Quality Center for engine replacement.
PIP4959D	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician with information regarding high misfire rates always on #1 cylinder. A customer may complain of misfires or roughness on cold start up with a P0300 diagnostic trouble code. Technician is to add coolant dye to the system and run the engine through warm up to circulate the dye. Pressurize the cooling system after a cold soak and inspect the cylinder with a bore scope for coolant dye. Dye is used to identify coolant over residual fuel being that might be left in the cylinder. The technician is not to replace the cylinder head as it will not correct this concern. In some cases it is necessary to remove the head for inspection. Do not replace the engine for small surface pock marks or a pitting appearance this is normal and do not connect to coolant passages. Usually if porosity is present there will be a break in the carbon ring. Only replace the engine if true porosity is found. Technician is to call Product Quality Center with the latest version of bulletin 02-07-30-029 if porosity is found and engine replacement is required.