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Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel
Motorad

Motorad 447-185 Engine Coolant Thermostat 185°F w/ Seal - 6.6L Diesel

$34.99 In Stock Sold out
SKU: 447-185
Categories:

FAST DELIVERY

100% ORIGINAL AND QUALITY

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  • Description
  • Fitment
  • Warranty and Refund
  • Reviews

Keep your 6.6L Duramax diesel running at the correct operating temperature with the Motorad 447-185 engine coolant thermostat. Built by an OE supplier to OEM specifications, this thermostat uses a copper case and wax compound to react quickly and accurately as coolant temperature changes, helping your cooling system respond the way it was designed to. The offset design and integrated air relief valve support proper installation and coolant flow, while the included OEM-style seal helps promote a leak-free fit at the housing. Rated to open at 185°F, this thermostat is designed as a direct-fit replacement, so there is no guesswork when it's time to restore reliable engine temperature regulation. Whether you're maintaining a Silverado, Sierra, Express, Savana, or Kodiak with the 6.6L diesel, the 447-185 gives you an OEM-quality option for a critical cooling system component.

Features

  • Copper case and wax compound deliver rapid, precise response to coolant temperature changes
  • Offset design and air relief valve support proper coolant flow and installation
  • Includes OEM-style seal for a leak-conscious, direct-fit installation experience
  • Opens at 185°F, matching OEM specification for correct engine operating temperature
  • Manufactured by an OE supplier to OEM materials, specifications, and processes

Application Summary

2001-2006 Chevrolet Silverado 3500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2001-2006 GMC Sierra 3500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2001-2024 Chevrolet Silverado 2500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2001-2024 GMC Sierra 2500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2003-2009 Chevrolet C4500 Kodiak 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2003-2009 Chevrolet C5500 Kodiak 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2003-2009 GMC C4500 Topkick 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2003-2009 GMC C5500 Topkick 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2005 Workhorse Custom Chassis P42 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2005-2011 Workhorse LF72 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2006 Hummer H1 6.6L -CC 400CID V8 OHV 32 Valve Turbocharged DIESEL
2006, 2008-2009 Chevrolet Express 3500 6.0L 5967CC 364CID V8 OHV 16 Valve Naturally Aspirated GAS
2006-2016 Chevrolet Express 2500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2006-2016 GMC Savana 2500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2006-2016 GMC Savana 3500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007 Chevrolet Silverado 2500 HD Classic 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007 Chevrolet Silverado 3500 Classic 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007 GMC Sierra 2500 HD Classic 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007 GMC Sierra 3500 Classic 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007 Workhorse Custom Chassis W72 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007, 2010-2016 Chevrolet Express 3500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007-2024 Chevrolet Silverado 3500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2007-2024 GMC Sierra 3500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2009-2016 Chevrolet Express 4500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2009-2016 GMC Savana 4500 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2019-2020 Chevrolet Silverado 4500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2019-2020 Chevrolet Silverado 5500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2019-2020 Chevrolet Silverado 6500 HD 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
2019-2020 International CV515 6.6L 6599CC 403CID V8 OHV 32 Valve Turbocharged DIESEL
Part Numbers: 447-185

Specifications

  • Brand: Motorad
  • Part Number: 447-185
  • Part Type: Engine Coolant Thermostat
  • UPC: 055644447858
  • GTIN: 00055644447858
  • Item Dimensions: 2.2500 x 2.2500 x 2.2500 IN
  • Package Dimensions: 2.2500 x 2.2500 x 2.2500 IN
  • Package Weight: 0.1500 PG
  • Package Quantity: 1 EA
  • Material: Steel
  • Material: Copper
  • Gasket or Seal Pre-Installed: Yes
  • Sealing Flange Outside Diameter: 2.13
  • Sealing Flange Outside Diameter: 54.10
  • Height Between Flanges: 1.31
  • Height Between Flanges: 33.274
  • MAP Controlled: No
  • Grade Type: OEM

Interchange

  • General Motors: 12680456
  • General Motors: 97241129
  • Omnicraft: QRT57
  • Parts Master: 54785
  • Motorad: 447-185
  • FVP Caps & Thermostats: 447-185
  • Murray Temperature Control: 44785
  • Pronto: 447-185
  • Federated: 447-185
  • Canadian Tire: 447-185
  • ACDelco: 12T99D
  • ACDelco: 131-163
  • ACDelco: 131-197
  • Worldparts: 9447185
  • Autopart International: 1601-290243
  • Gates: 33946
  • Stant: 14728
  • Pep Boys: 447-185
  • Balkamp: 389-195
  • OMNIPARTS: 447-185

Warranty

  • Warranty Duration: 12 Months

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.

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