AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1

AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1

Marsoni

M251S

$41.95

Get it in 3 business days with 1 day shipping. Friday, May 29

AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1LS Gen 3 Thermostat and Housing Genuine AC Delco OEM replacement part Compatible with 1999 to 2006 Gen 3 Silverado water pumps 4. 8L 5. 3L 6. 0L (Will not fit Gen 4 Truck "large" bolt pattern straight neck, or LS3 water pumps) Includes: OE temperature thermostat, housing inlet, and seal

Easy Shipping

Quick Dispatch:

Your AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1 orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1 ships.

Need Help?
Questions about AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for AC Delco LS Gen 3 187 Degree Thermostat and Housing 2003-2006 4.8L 5.3L 6.0L LS1 in your area.

Get Shipping Estimates

Country Zip/Postal Code

Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

This seems to work very well. I will say that it seems to be pretty important to move the wheel around as soon as you can to distribute the product within the tire. I was held up for a few minutes and the Liqui tube seemed to start to set up in one spot and made the tire out of balance so I had to work quick to get it to distribute to the other parts of the tire. It seems to have worked though and so far the tires are holding air very well. I will be interested to see if it lasts for a long time but so far so good.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on May 18, 2026