Make sure this part fits

GMC 20878785 A/C And Heater Control Assembly

2009-2011 GMC Sierra

Customer Questions & Expert Answers (3)
20878785 GM A/C And Heater Control Assembly Illustration 1 of 1
  • Part Description
    CONTROL, A/C Instrument Panel
  • Replaces
    25774838
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number20878785
    Part DescriptionCONTROL, A/C Instrument Panel
    Other NamesHeater Control
    Item Dimensions13.3 x 4.3 x 4.3 inches
    Item Weight1.10 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces25774838
    ManufacturerGeneral Motors
    SKU20878785
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2009-2011 GMC Sierra6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L FlexCREW CAB 1/2 TON
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 20878785 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    How do you remove the rear auxiliary heater control and A/C Switch for the 2011 GMC Sierra? Posted by Leighton S.
    A:
    Pry out the trim panel from the back of the console and disconnect the electrical connectors and mounting screws. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Mar 30, 2025
    Q:
    How do you remove the front heater control and A/C Switch of the 2009 Chevrolet Silverado? Posted by Yves O.
    A:
    Start by disconnecting the battery cable from the negative terminal. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Feb 08, 2026

Genuine GM Part 20878785, the Right Choice

To ensure reliability, purchase GM part # 20878785 A/C And Heater Control Assembly. It is sometimes referred to as GMC A/C Switch, GMC Blower Control Switches. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific GMC Sierra models.

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