Easy — 1–2 hours
Description
This housing includes a housing gasket and thermostat gasket. It features a 45-degree housing neck angle, a 0.36-inch mounting hole diameter, and five mounting holes. The package contents include the coolant adapter pipe and an ignition wire holder, but not the thermostat itself. It is a direct replacement for the original housing on Chevrolet S10 and GMC Sonoma models from 1998-2003. The OE number cross-reference is 12563996.
Fitment
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Specifications
| Brand | Dorman |
| Part Number | D00I 902-103 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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