<div data-store-description="v1"> <p>Thermostat Housing (1999–2004) for GMC Sierra 1500, Yukon. Supplied product details follow.</p> <h3>Specifications and fitment</h3> </div> <p>Includes: <br>- Thermostat Housing</p> <p>Fits Models: <br>- GMC Sierra 1500 <br>- GMC Yukon</p> <p>Model Years: <br>- 1999–2004</p> <p>Submodels: <br>- Common trims include SL, SLE, SLT, Denali <br>- Chassis codes: GMT800 <br>- Body styles: Crew Cab, Extended Cab, SUV</p> <p>Engine Options: <br>- 4.3L V6 (L35), 4.8L V8 (LM7), 5.3L V8 (LM7, L59), 6.0L V8 (LQ4), 8.1L V8 (L18)</p> <p>Description: <br>This thermostat housing is designed for the GMC Sierra 1500 and Yukon models from 1999 to 2004. It ensures proper coolant flow and engine temperature regulation, preventing overheating and maintaining optimal performance.</p> <p>Features: <br>- Direct fit replacement for easy installation <br>- Durable construction for long-lasting performance <br>- Compatible with multiple engine options <br>- Designed to meet or exceed OEM specifications <br>- Helps maintain engine efficiency and reliability</p>