GMC Sierra 2500/3500 HD Block Heater Guide
2011–2026
Engine-specific fitment for the GMC Sierra 2500/3500 HD is listed below — aftermarket elements are available for most engines, with Zerostart and Kat's part numbers shown where the application guides list a direct fit.
Factory availability
Factory option or dealer accessory in Canada, depending on year and trim
Cord location
Most installs route the cord to the front grille or bumper area, driver's side. Check for an existing coiled cord before buying anything.
GMC Sierra 2500/3500 HDengines & block heater part numbers
Engine list built from Natural Resources Canada model-year data; part numbers cross-referenced against the Zerostart / Phillips & Temro and Kat's application guides. Always confirm displacement and model year before ordering.
| Engine | Years | Zerostart kit | Cord | Kat's heater | Install location |
|---|---|---|---|---|---|
| 6L 8-cyl | 2011–2019 | 3100109(28 MM bore) | 3600082 | 11484+ cord 28510 | —(N/A THD N/A position) |
| 6.6L 8-cyl diesel | 2011–2026 | No aftermarket listing — use the genuine GMC dealer kit | |||
| 6.6L 8-cyl | 2020–2026 | No aftermarket listing — use the genuine GMC dealer kit | |||
Zerostart part numbers: 31/35-prefix = heater kit, 36-prefix = detachable cordset. Kat's: 11xxx = heater element, 28xxx = cordset, 24xxx = pad heater. Install location codes are from the manufacturer's guide (LF = left front of block, RR = right rear, etc.); "position" is the element's clock orientation during install.
First: check whether you already have one
In Canada, block heaters are frequently installed at the port, the dealer, or by a previous owner — and then forgotten. Look for a two- or three-prong plug on a black cord near the grille, bumper, or tow hooks, sometimes still zip-tied from the factory. If you find one, test it before winter with our 5-minute multimeter test.
If you need one installed
A circulating (pump) coolant heater for the GMC Sierra 2500/3500 HD typically runs $120–$400 CAD for the part, plus shop installation. See installation costs in your city — and book in October, before the first cold snap fills every shop calendar in the Prairies.
FAQ
Does the GMC Sierra 2500/3500 HD come with a block heater?
Factory option or dealer accessory in Canada, depending on year and trim. Check behind the grille for a coiled cord before buying anything — many Canadian-market vehicles have a heater installed that the owner never knew about.
What block heater fits a GMC Sierra 2500/3500 HD?
The recommended setup is a circulating (pump) coolant heater (typically 750–1,000 W). Engine-specific fitment for the GMC Sierra 2500/3500 HD is listed below — aftermarket elements are available for most engines, with Zerostart and Kat's part numbers shown where the application guides list a direct fit.
What is the block heater part number for a GMC Sierra 2500/3500 HD?
6L 8-cyl: Zerostart kit 3100109 with cord 3600082 (Kat's 11484). Confirm displacement and model year against the fitment table before ordering.
Where is the block heater cord on a GMC Sierra 2500/3500 HD?
Most installs route the cord to the front grille or bumper area, driver's side. Check for an existing coiled cord before buying anything.
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