Description
Warranty & Shipping
How-To & Tools
Product Reviews
Q&A
Vehicle Fit

AC DELCO K040378HD (Heavy Duty) [SERPENTINE BELT]

This AC DELCO serpentine belt is a new part. It is the same part that you would receive if you purchased it from your local GM dealer.

Specifications:

  • Brand New AC Delco Serpentine Belt
  • Outstanding crack resistance at extreme temperatures
  • Designed for the toughest applications; a problem-solving belt
  • Replaces dealer part numbers: F4BZ 8620 B, F4BZ8620B, 12554028, 12569346, 12576447, 19163445, 56992PY30040, 56992PY3A02, 56992PY3A020, 56992PY3A020M2, 2312733300, 8943821060, 8970645550, 1K2AA15908, F388HHVMA02, B3C715909C, B63H15909, MD308925, 11720D4001, 119200P500, 11920F6501, 773021, 809213040
  • Built to strict quality control standards
  • Direct replacement
    • Rib Number: 4
    • Top Width: 0.56 Inches
    • Effective Length: 37.89 Inches

Part Details

  • Product Grade: Heavy Duty

Wear and Tear

This item is backed by a 60-day warranty against defects in materials and workmanship under its intended use. The warranty does not cover normal wear and tear. 

  1. step : Removing the Air Intake Hose (0:40)
    • Loosen the air intake hose clamps with a flat blade screwdriver
    • Unclip the intake hose from the radiator hose
    • Pull the intake hose up and out
  2. step : Removing the Radiator Fan Shroud (1:23)
    • Remove the two 10mm bolts from the radiator fan shroud
    • Unclip the radiator hose from the fan shroud
    • Pry the four plastic clips out of the fans shroud with a flat blade screwdriver
    • Pull the fan shroud up and out
  3. step : Removing the Serpentine Belt (2:39)
    • Attach a 15mm socket and ratchet to the serpentine belt tensioner
    • Turn the tensioner counterclockwise to loosen the belt
    • Pull the belt off the tensioner
    • Release the tensioner
    • Pull the belt off all the pulleys
  4. step : Removing the A/C Compressor Belt (3:16)
    • Remove the five 15mm bolts from the skid plate
    • Attach a 3/8 inch ratchet to the A/C belt tensioner
    • Pull the tensioner down to loosen the belt
    • Pull off the A/C belt
  5. step : Installing the New A/C Belt (4:01)
    • Feed the new A/C belt into place
    • Attach a 3/8 inch ratchet to the A/C belt tensioner
    • Pull the tensioner down to loosen the belt
    • Pull the belt around the pulleys
    • Release the tensioner
    • Lift the skid plate into place
    • Insert the five 15mm bolts into the skid plate
  6. step : Reinstalling the Serpentine Belt (5:24)
    • Familiarize yourself with the belt routing diagram
    • Route the belt onto all but one pulley, following the diagram
    • Attach a 15mm socket and ratchet to the serpentine belt tensioner
    • Turn the tensioner counterclockwise to loosen the belt
    • Pull the belt onto the remaining pulley
    • Release the tensioner
  7. step : Reinstalling the Fan Shroud (6:35)
    • Push the fan shroud into place
    • Push the four plastic clips into the fan shroud
    • Clip the radiator hose into the fan shroud
    • Insert the two 10mm bolts into the fan shroud
  8. step : Reinstalling the Air Intake Hose (7:15)
    • Push the intake hose into place
    • Tighten the intake hose clamps with a flat blade screwdriver
    • Clip the radiator hose to the air intake hose

Tools needed for replacement:

    Ratchets & Related

  • 3/8 Inch Drive Ratchet
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket
  • 15mm Socket

There are no reviews for this item.
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
No questions have been asked about this item.
Year Make Model Description
1996-1997Acura SLX Acura SLX Alternator & Fan Heavy Duty Serpentine Belt V6 3.2L ACDelco K040378HD
2002-2005Cadillac Escalade Cadillac Escalade Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2002-2006Cadillac Escalade Cadillac Escalade Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008Cadillac Escalade Cadillac Escalade Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.2L for ACDelco K040378HD
2003-2006Cadillac Escalade ESV Cadillac Escalade ESV Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008Cadillac Escalade ESV Cadillac Escalade ESV Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.2L for ACDelco K040378HD
2002-2006Cadillac Escalade EXT Cadillac Escalade EXT Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008Cadillac Escalade EXT Cadillac Escalade EXT Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.2L for ACDelco K040378HD
2007-2008Chevy Avalanche Chevy Avalanche Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008Chevy Avalanche Chevy Avalanche Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2002-2006Chevy Avalanche 1500 Chevy Avalanche 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2003-2008Chevy Express 1500 Van Chevy Express 1500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2003-2005Chevy Express 2500 Van Chevy Express 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2003-2008Chevy Express 2500 Van Chevy Express 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2003-2008Chevy Express 2500 Van Chevy Express 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2003-2008Chevy Express 3500 Van Chevy Express 3500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2005-2008Chevy Express 3500 Van Chevy Express 3500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
1999-2008Chevy Silverado 1500 Chevy Silverado 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
1999-2008Chevy Silverado 1500 Chevy Silverado 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2001-2008Chevy Silverado 1500 Chevy Silverado 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007Chevy Silverado 1500 Classic Chevy Silverado 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007Chevy Silverado 1500 Classic Chevy Silverado 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2007Chevy Silverado 1500 Classic Chevy Silverado 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2001-2003Chevy Silverado 1500 HD Chevy Silverado 1500 HD Serpentine Belt for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
2005-2006Chevy Silverado 1500 HD Chevy Silverado 1500 HD Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007Chevy Silverado 1500 HD Classic Chevy Silverado 1500 HD Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
1999-2000Chevy Silverado 2500 Chevy Silverado 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
1999-2004Chevy Silverado 2500 Chevy Silverado 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2001-2008Chevy Silverado 2500 HD Chevy Silverado 2500 HD Serpentine Belt V8 6.0L for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
2007Chevy Silverado 2500 HD Classic Chevy Silverado 2500 HD Classic Serpentine Belt V8 6.0L for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
2001-2006Chevy Silverado 3500 Chevy Silverado 3500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007Chevy Silverado 3500 Classic Chevy Silverado 3500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008Chevy Silverado 3500 HD Chevy Silverado 3500 HD Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2000-2008Chevy Suburban 1500 Chevy Suburban 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2006-2008Chevy Suburban 1500 Chevy Suburban 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2000-2008Chevy Suburban 2500 Chevy Suburban 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2000-2008Chevy Tahoe Chevy Tahoe Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2000-2008Chevy Tahoe Chevy Tahoe Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2003-2008GMC Savana 1500 Van GMC Savana 1500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2003-2008GMC Savana 2500 Van GMC Savana 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2003-2008GMC Savana 2500 Van GMC Savana 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2003-2005GMC Savana 2500 Van GMC Savana 2500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2003-2008GMC Savana 3500 Van GMC Savana 3500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2004-2008GMC Savana 3500 Van GMC Savana 3500 Van Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
1999-2008GMC Sierra 1500 GMC Sierra 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
1999-2008GMC Sierra 1500 GMC Sierra 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2001-2008GMC Sierra 1500 GMC Sierra 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2001-2008GMC Sierra 1500 GMC Sierra 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 4.8L for ACDelco K040378HD
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2001-2003GMC Sierra 1500 HD GMC Sierra 1500 HD Serpentine Belt for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
2005-2006GMC Sierra 1500 HD GMC Sierra 1500 HD Serpentine Belt for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
2007GMC Sierra 1500 HD Classic GMC Sierra 1500 HD Classic Serpentine Belt for Air Conditioning Compressor Heavy Duty ACDelco K040378HD
1999-2000GMC Sierra 2500 GMC Sierra 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
1999-2004GMC Sierra 2500 GMC Sierra 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2001-2008GMC Sierra 2500 HD GMC Sierra 2500 HD Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007GMC Sierra 2500 HD Classic GMC Sierra 2500 HD Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2001-2006GMC Sierra 3500 GMC Sierra 3500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007GMC Sierra 3500 Classic GMC Sierra 3500 Classic Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2007-2008GMC Sierra 3500 HD GMC Sierra 3500 HD Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2000-2008GMC Yukon GMC Yukon Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2000-2008GMC Yukon GMC Yukon Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2000-2008GMC Yukon XL 1500 GMC Yukon XL 1500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 5.3L for ACDelco K040378HD
2000-2008GMC Yukon XL 2500 GMC Yukon XL 2500 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2003-2007Hummer H2 Hummer H2 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.0L for ACDelco K040378HD
2008Hummer H2 Hummer H2 Air Conditioning Compressor Heavy Duty Serpentine Belt V8 6.2L for ACDelco K040378HD
Only 1 left in stock
Part #: 1AESB00053


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

AC DELCO
Brand #: K040378HD

How-to Video:

(08:00 min)