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SKU: 538-187
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- Description
- Fitment
- Warranty and Refund
- Reviews
The Motorad 538-187 is a complete engine coolant thermostat housing assembly built to OEM specifications, giving you a straightforward, direct-fit replacement without hunting for separate parts. Its aluminum, copper, and stainless steel construction is paired with a copper case and wax compound thermostat element designed to respond quickly and consistently to coolant temperature changes, opening at 187°F (86.11°C) to help maintain proper engine operating temperature. The assembly includes a rubber seal, so you're not left sourcing a separate gasket, and the built-in jiggle pin check valve along with a bleeder hole helps with proper air release during coolant system fill-ups. With an offset outlet port design and OEM-style seal integration, this housing is engineered for reliable, worry-free installation on applicable GM and Isuzu light-duty trucks from 2004-2012. Verify your specific year, make, model, and engine before ordering.
Features
- Complete housing assembly with included rubber seal saves a separate parts search at checkout
- Copper case and wax compound design delivers consistent, precise response to coolant temperature changes
- Built-in jiggle pin check valve plus bleeder hole assist proper air release when filling coolant
- Aluminum, copper, and stainless steel construction built to OEM specifications for direct-fit installation
- 187°F (86.11°C) opening temperature matches original equipment thermal control for supported applications
Application Summary
2004-2005 Chevrolet Colorado 3.5L 3460CC 211CID L5 DOHC 20 Valve Naturally Aspirated GAS2004-2005 GMC Canyon 3.5L 3460CC 211CID L5 DOHC 20 Valve Naturally Aspirated GAS
2004-2006 Chevrolet Colorado 2.8L 2770CC 169CID L4 DOHC 16 Valve Naturally Aspirated GAS
2004-2006 GMC Canyon 2.8L 2770CC 169CID L4 DOHC 16 Valve Naturally Aspirated GAS
2006 Hummer H3 3.5L 3460CC 211CID L5 DOHC 20 Valve Naturally Aspirated GAS
2006 Isuzu i-280 2.8L 2770CC 169CID L4 DOHC 16 Valve Naturally Aspirated GAS
2006 Isuzu i-350 3.5L 3460CC 211CID L5 DOHC 20 Valve Naturally Aspirated GAS
2007-2008 Isuzu i-290 2.9L 2921CC 178CID L4 DOHC 16 Valve Naturally Aspirated GAS
2007-2008 Isuzu i-370 3.7L 3654CC 223CID L5 DOHC 20 Valve Naturally Aspirated GAS
2007-2009 Hummer H3 3.7L 3654CC 223CID L5 DOHC 20 Valve Naturally Aspirated GAS
2007-2012 Chevrolet Colorado 2.9L 2921CC 178CID L4 DOHC 16 Valve Naturally Aspirated GAS
2007-2012 Chevrolet Colorado 3.7L 3654CC 223CID L5 DOHC 20 Valve Naturally Aspirated GAS
2007-2012 GMC Canyon 2.9L 2921CC 178CID L4 DOHC 16 Valve Naturally Aspirated GAS
2009 Hummer H3T 3.7L 3654CC 223CID L5 DOHC 20 Valve Naturally Aspirated GAS
2009-2012 GMC Canyon 3.7L 3654CC 223CID L5 DOHC 20 Valve Naturally Aspirated GAS
2010 Hummer H3 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
2010 Hummer H3T 5.3L 5328CC 325CID V8 OHV 16 Valve Naturally Aspirated FLEX
Part Numbers: 538-187
Specifications
- Brand: Motorad
- Part Number: 538-187
- Part Type: Engine Coolant Thermostat Housing Assembly
- UPC: 055644538877
- GTIN: 00055644538877
- Package Dimensions: 13.2 x 12.2 x 6.2 IN
- Package Weight: 5.57 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.