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SKU: 379-187
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- Description
- Fitment
- Warranty and Refund
- Reviews
The Motorad 379-187 delivers a complete engine coolant thermostat housing assembly built to OEM specifications, combining the housing, thermostat, and seal in one direct-fit unit. Constructed from aluminum, copper, and stainless steel, this assembly is engineered for reliable long-term service in demanding cooling systems. The included thermostat opens at 187°F to help maintain consistent engine temperature, while the built-in jiggle pin check valve and bleeder hole assist with proper air release during coolant system fill-ups. An O-ring seal is included, so there's no need to source a separate gasket for installation. Sized with a 4.37" x 2.75" flange and 1.5" outlet port, this housing fits a wide range of GM-platform V8 engines from 1997-2003, including popular Silverado, Escalade, Suburban, Express, Camaro, and Corvette applications. For shops and DIYers replacing a cracked, leaking, or corroded housing, this all-in-one assembly simplifies the job with fewer parts to source separately.
Features
- Complete assembly with housing, 187°F thermostat, and O-ring seal saves a separate parts search
- Jiggle pin check valve helps release trapped air for proper coolant system bleeding
- Aluminum, copper, and stainless steel construction built to OEM specifications for reliable service
- Bleeder hole design supports easier air purge during coolant fill and system service
- Three mounting holes and OEM-style flange dimensions support straightforward, direct-fit installation
Application Summary
1997-2003 Chevrolet Corvette 5.7L -CC 350CID V8 OHV 16 Valve Naturally Aspirated GAS1998-2002 Chevrolet Camaro 3.8L 3800CC 231CID V6 OHV 12 Valve Naturally Aspirated GAS
1998-2002 Pontiac Firebird 3.8L 3800CC 231CID V6 OHV 12 Valve Naturally Aspirated GAS
1999-2000 Chevrolet Silverado 2500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2000 GMC Sierra 2500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2001 Chevrolet Silverado 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2001 GMC Sierra 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2001, 2003 GMC Sierra 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2002 Chevrolet Silverado 1500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2003 Chevrolet Silverado 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
1999-2003 GMC Sierra 1500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2001, 2003 Chevrolet Tahoe 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2001, 2003 GMC Yukon 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2002 Chevrolet Suburban 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2003 Chevrolet Suburban 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2003 Chevrolet Tahoe 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2003 GMC Yukon 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2003 GMC Yukon XL 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2000-2003 GMC Yukon XL 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001 Chevrolet Silverado 2500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001 GMC Sierra 2500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001-2002 Chevrolet Sonora 5.7L -CC 350CID V8 OHV 16 Valve Naturally Aspirated GAS
2001-2003 Chevrolet Silverado 1500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001-2003 Chevrolet Silverado 3500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001-2003 GMC Sierra 1500 4.3L -CC 262CID V6 OHV 12 Valve Naturally Aspirated GAS
2001-2003 GMC Sierra 1500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2001-2003 GMC Sierra 3500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2002 Chevrolet Silverado 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2002 Chevrolet Silverado 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated BI-FUEL
2002 Chevrolet Tahoe 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2002 GMC Sierra 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2002-2003 Cadillac Escalade 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2002-2003 Cadillac Escalade 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2002-2003 Cadillac Escalade EXT 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2002-2003 Chevrolet Avalanche 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2002-2003 Chevrolet Silverado 2500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2002-2003 Chevrolet Suburban 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2002-2003 GMC Sierra 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2002-2003 GMC Sierra 2500 HD 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2002-2003 GMC Yukon 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2002-2003 GMC Yukon XL 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2003 Cadillac Escalade ESV 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Express 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Express 2500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Express 2500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Express 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2003 Chevrolet Express 3500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Express 3500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2003 Chevrolet SSR 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Silverado 1500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet Sonora 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet W3500 Tiltmaster 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Chevrolet W4500 Tiltmaster 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Envoy XL 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Savana 1500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Savana 2500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Savana 2500 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Savana 2500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2003 GMC Savana 3500 4.8L -CC 294CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 GMC Savana 3500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated CNG
2003 GMC W3500 Forward 4.8L -CC 290CID L4 U/K U/K Valve Turbocharged DIESEL
2003 GMC W4500 Forward 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Hummer H2 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2003 Isuzu Ascender 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
2003-2006 Chevrolet Cheyenne 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated GAS
Part Numbers: 379-187
Specifications
- Brand: Motorad
- Part Number: 379-187
- Part Type: Engine Coolant Thermostat Housing Assembly
- UPC: 055644379876
- GTIN: 00055644379876
- Package Dimensions: 13.2 x 12.2 x 6.2 IN
- Package Weight: 4.92 LB
- Package Quantity: EA
Returns
30-Day Money-Back Guarantee
We want you to be completely satisfied with your purchase! If you are not happy for any reason, you may return the item within 30 days for a refund, minus shipping fees, provided that: The part is brand new, uninstalled, and undamaged in any way.
To initiate a return, please contact us or email support@mizumoauto.com for a Return Authorization Number (RMA) and the return shipping address. Returns without an RMA number will be refused and returned to you at your expense.
Return Requirements:
- Items must be securely packed in the original manufacturer's packaging.
- All original materials must be included, such as hardware, manuals, protective caps, wrapping, and instructions.
- You must obtain and retain the tracking number for your return.
Non-Returnable Items:
- Piston rings, main bearings, and rod bearings are non-returnable if the manufacturer’s seal or shrink-wrapped plastic has been opened. No exceptions—this ensures the integrity of the parts you receive.
We are not responsible for lost or damaged returns. If your return is lost or damaged during shipping, a refund cannot be issued, as the item cannot be resold or returned to the supplier. Please file a claim directly with your shipping carrier for reimbursement.
Refunds are processed within 1-2 business days after we receive and inspect the returned item. Please allow this processing time before inquiring about your refund status.
Warranty
Mizumo Auto provides a 90-day Limited Warranty against defects in workmanship and materials under normal service conditions, effective from the original delivery date.
This warranty is non-transferable and applies only to the original purchaser. Coverage is limited to the replacement or refund of defective products.
Exclusions:
The warranty does not cover labor costs, damage resulting from accidents, misuse, alterations, or unauthorized modifications, as well as additional expenses such as towing, fluids, oils, car rentals, and any other parts not included in the original purchase.
Warranty Claims Process:
- All warranty claims must be pre-authorized and returned prepaid to Mizumo Auto for inspection and approval.
- No exchanges will be made for products that have been damaged, misused, or improperly installed. We strongly recommend professional installation.
- The buyer assumes all risk of damage resulting from improper installation.
All disputes related to transactions shall be resolved by a court of competent jurisdiction in Los Angeles County, California.
Shipping
We offer Free UPS Ground or USPS Ground Advantage shipping within the continental U.S. (48 states).
Shipping to Other Locations:
A delivery surcharge applies to shipments to: Alaska, Hawaii, Puerto Rico, U.S. territories, APO/FPO addresses, Canada, and international destinations.
Order Processing & Tracking:
- Orders are shipped Monday through Friday, excluding holidays.
- Orders placed before 3:00 PM PST will ship the same day, unless unexpected delays occur.
- A tracking number will be emailed within one business day after shipping.
If you do not receive a tracking number, please:
- Check your spam/junk folder.
- If it's not there, contact us via phone or eBay message for assistance.
International Orders:
Import duties, taxes, and brokerage fees are not included in the shipping fee. Please check with your shipping carrier and local customs office regarding any applicable fees before placing your order.