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1991 Buick Skylark
3-Speed Automatic Transmission, THM125C/3T40
-- Select Engine --
Engine Description RPO Code
The drop down menu includes engine codes with descriptions and engine sizes. Please use the following tutorial to locate the actual engine size of your vehicle; it could help you make the correct selection.
  • 4 Cyl 2.3L DOHC LD2
  • 4 Cyl 2.5L TBI L68
  • 6 Cyl 3.3L LG7
-- Select Transmission --
Transmission Description RPO Code
  • 3-Speed Automatic Transmission, THM125C/3T40 MD9
-- Select Model Code --
Model Code Description RPO Code
A GM Model Code can be found on both the Service Tag and Service Parts Identification Tag.
  • Skylark 4 Door 4NC69
  • Skylark Custom 2 Door 4NJ27
  • Skylark Gran Sport 2 Door 4NM27
  • Skylark Luxury Edition 4 Door 4ND69
Parts Question Guide

Parts found for 1991 Buick Skylark > Body Mounting, Air Conditioning, Audio/Entertainment > A/C Control System Vacuum

Part No. Part Description Retail


ACTUATOR, A/C Control Make Sure These Fit
















VALVE, A/C Control Make Sure These Fit




Standard Parts



Although General Motors no longer manufactures this part, we may still have stock or the ability to special order it.

To verify availability, please contact us. We will respond promptly.

There are multiple parts that fit your vehicle, select the one that best matches your needs, or select vehicle options to filter result.
Genuine GM Parts, the Right Choice offers the lowest prices for genuine 1991 Buick Skylark parts. Parts like A/C Control System Vacuum are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.3L, 4 Cyl 2.5L, 6 Cyl 3.3L. Model Code: 4 DOOR, CUSTOM 2 DOOR, GRAN SPORT 2 DOOR, LUXURY EDITION 4 DOOR.
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This part contains hazardous material.

This part is a packaged part and contains multiple quantities of: (Pack Qty: )


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This part is a packaged part and contains multiple quantities of the same item. In an effort to simplify packaging GM will sometimes include multiple parts in a package.