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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 2003 GMC Sierra 1500 HD SLT.
Denso
$19.24
Motorad
$130.55
URO Parts
$30.85
ContiTech
$26.96
Dorman
$70.94
Spectra Premium
$140.15
Four Seasons
$293.26
Vernet
$25.05
Dorman
$3.88
GPD
$91.40
Sunsong
$32.18
Skyward Automotive
$37.95
CSF
$91.05
Koyorad
$94.44
Skyward Automotive
$103.30
Motorad
$172.94
Four Seasons
$41.50
Four Seasons
$34.22
Dayco
$43.58
Four Seasons
$40.03
This page groups parts listed for the 2003 GMC Sierra 1500 HD SLT. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of cooling system parts for the 2003 GMC Sierra 1500 HD SLT. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Dorman, Four Seasons, Motorad, Gates, and Spectra Premium, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
