Motorad 545-180 Engine Coolant Thermostat
OE Quality 60-Day Returns
Motorad
 Standard

Motorad 545-180 Engine Coolant Thermostat

Brand Motorad 545-180
Bypass Diameter 1.09 in
Bypass Length 1.74 in
Flange Thickness 0.05 in
Gasket Or Seal Included Yes
Gasket/Seal Material Rubber
Gasket/Seal Material Rubber
Height 2.43
Height Between Flanges 1.7
Installation Tool Included No
Jiggle Pin Weep Hole Yes
Number Of Seals 1
Seal Type O-Ring
Sealing Flange Outside Diameter 2.1
Start to Open Temperature 180
Temperature 180 Deg. F
Temperature (Degree) 180
Type Standard
Product line Standard
Fits Hyundai and Kia · 25 vehicles

OE supplier quality. Built with OEM materials and manufacturing processes.

Rapid temperature response. Copper case and wax compound react quickly to coolant changes.

Seal included. O-ring seal and OEM-style seals are included where applicable.

Cross-references AMS Automotive 4808, Four Seasons 54580 and Motorad 545-180 for the same application. See all 10.

$20.87Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $20.87
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Engine Coolant Thermostat options

Motorad 545-180 Engine Coolant Thermostat

The Motorad Standard 545-180 is a 180°F engine coolant thermostat built with OEM-quality materials and OE-supplier manufacturing standards. It is made for stable coolant temperature control in demanding cooling systems and includes an O-ring seal for service-ready installation.

Key Features

  • 180°F start-to-open temperature for standard cooling system operation
  • Copper case and wax compound for responsive temperature changes
  • Offset design with air relief valve where applicable
  • OEM-style seals included where applicable
  • Jiggle pin weep hole for air bleeding during service
  • Rubber O-ring seal included
  • Sealing flange outside diameter: 2.1 in
  • Height: 2.43 in; height between flanges: 1.7 in
  • Bypass diameter: 1.09 in; bypass length: 1.74 in
  • Flange thickness: 0.05 in

Product Details

Motorad Standard focuses on OE-style replacement cooling components built to factory specifications and processes. This 545-180 thermostat is engineered for direct temperature regulation in the cooling system, helping maintain proper engine operating temperature in vehicles such as the 1999-2005 Hyundai Sonata and 2001-2006 Hyundai Santa Fe, as well as 2001-2006 Kia Magentis and 2001-2006 Kia Optima. This part number, 545-180, is also cross-referenced with Four Seasons 54580 for the same application.

What It Helps Address

  • Engine running too cool or taking too long to reach operating temperature
  • Temperature fluctuations caused by a worn thermostat
  • Coolant flow control issues in the thermostat housing circuit
  • Air trapped in the cooling system during service
  • Replacement needs for OE-style thermostat service on Hyundai and Kia applications

Installation Notes

Verify housing dimensions, bypass sizing, and seal style before installation. The included O-ring seal supports a proper seal at the thermostat housing, and the jiggle pin weep hole helps release trapped air during filling. Confirm the 180°F specification and application match before service on Hyundai Sonata, Hyundai Santa Fe, Kia Magentis, or Kia Optima models.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and processes, this thermostat is built to meet factory-level safety and performance expectations for cooling system service.

Related reading

This part fits 25 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2006HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2006KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2006KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2005HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2005HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
2005KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2005KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2004HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2004HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
2004KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2004KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2003HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2003HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
2003KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2003KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2002HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2002HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
2002KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2002KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2001HyundaiSanta Fe2.4LL4N/A180F thermostat with seal.; Standard
2001HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
2001KiaMagentis2.4LL4N/A180F thermostat with seal.; Standard
2001KiaOptima2.4LL4N/A180F thermostat with seal.; Standard
2000HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
1999HyundaiSonata2.4LL4N/A180F thermostat with seal.; Standard
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AMS Automotive — 4808Four Seasons — 54580Motorad — 545-180Remy — 14808392-1801601-3166184826895451802550038001P4808