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

Marsoni M251S
Sale price$41.95
Pay 4 payments of $10.49 a month.Shop Pay
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
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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

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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.

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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
4.5 ★★★★★
Based on 1116 reviews
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Product Reviews
J
Verified Purchase
Juli J. Denning
Grantham, US
★★★★★ 5
Soft, comfortable and really nice.
Size: Full
This product is of really nice material. It's soft and comfortable, deep pockets and fits my bed perfectly. It's a great product, however, if you're looking for something for back support, this isn't it. It isn't for me anyway - there's no firmness to this topper at all but it is very comfortable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
M
Verified Purchase
Mrs. V
Dallas, US
★★★★★ 5
COMFORTABLE AND WORTH THE MONEY
Size: Queen
Excellent mattress topper. Its thick and paired with my matress provides a high end hotel feel. I have had it for a few months and it has not lost its shape and stays in place. Worth the money. You are definitely getting what you paid for.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
P
Verified Purchase
Pam
Lowell, US
★★★★★ 5
Awesome!!
Size: King
This mattress topper is like sleeping on a cloud. It is so soft and comfortable to sleep on. It stays on the mattress very nice. Great price for a very nice topper. Highly recommend
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 23, 2026
I
Verified Purchase
ilovepugs
Dallas, US
★★★★★ 5
Wow!!!
Size: King
I couldn’t be happier with this mattress cover—it completely transformed my sleep. I had one of the best nights of sleep I’ve had in a long time—no tossing and turning, just pure comfort. It stays in place nicely and feels high-quality and well-made. Fluffy without the bulk. If you’re looking to upgrade your sleep without buying a whole new mattress, this is absolutely worth it. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026
A
Verified Purchase
Ana M Vega
Waukegan, US
★★★★★ 4
Best sleep matress topper
Size: Queen
Ordered after running out of options to get a good night's rest. Placed Q sized mattress topper on a tempur pedic matress and 1st night slept like a baby on a cloud. Ever since then I have knocked out after sleeping and moved less at night. Restful sleep has blessed out house again. It feels like a hotel comfy mattress. Totally recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 8, 2026

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