pontiac Workshop Repair Guides

Pontiac Workshop Service and Repair Manuals

All Other Service Bulletins for Heater Core: > < Heater - Slow Warm Up/Inadequate Performance at Idle
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2. Backflush heater core.

3. Reconnect heater hoses.

For thermostat, floor air outlet, and EPROM service procedures, refer to the appropriate Service Manual.

PARTS INFORMATION

Important: 

The following kit numbers contain the parts needed to perform this procedure. The EPROM numbers are for reference only.

Kit numbers:

1992 L40 

Federal Emissions 

22646937

1992 LD2 

Federal Emissions 

22646938

1993 L40 

Federal Emissions 

22646939

1993 LD2 

Federal Emissions 

22646940

1992-93 L40/LD2 

California Emissions 

22646941

1992-93 LG7 

All Emissions 

22646941

EPROM Part Numbers:

Model/

Trans/

Broadcast

Part

Year

Division

Engine VIN

Emission

Code

Scan I.D. 

Number

1992 

2,3,4 N

L40/3AMT

Federal

BNUP

5563

16215577

1992 

2,3,4 N

LD2/3AMT

Federal

BNUR

5573

16215579

1993 

2,3,4 N

L40/3AMT

Federal

BNUS

5583

16215581

1993 

2,3,4 N

LD2/3AMT

Federal

BNUT

5593

16215584

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Operation  

Labor Time

D2813 (Thermostat, floor air outlet, 

1.6 hrs (2.3L Engines 

EPROM, heater core flush)  

W/Federal Emissions)

 
D2813 (Thermostat, floor air outlet,   

1.4 hrs (2.3L Engines  

heater core flush)

W/California Emissions)

D2813 (Floor air outlet,   

1.0 hr 

heater core flush) 

(All 3.3L engines)

All Other Service Bulletins for Heater Core: > < Heater - Slow Warm Up/Inadequate Performance at Idle