Motorcraft RT-1253 Thermostat Assembly Ford 3.5L 3.7L 2005–2020 | F-150 Mustang Edge + Install Video
Motorcraft RT-1253 Thermostat Assembly Ford 3.5L 3.7L 2005–2020 | F-150 Mustang Edge + Install Video
Motorcraft RT-1253 Thermostat Assembly — Ford 3.5L and 3.7L 2005–2020
Regain optimum engine temperature control with the Motorcraft RT-1253 Engine Coolant Thermostat Assembly. Specifically designed for Ford 3.5L (non-turbo) and 3.7L engines, this OEM thermostat ensures your engine reaches and maintains its correct operating temperature, protecting against overheating and maximizing fuel efficiency.
🎥 FREE Step-by-Step Installation Video Included
Every order includes access to our dedicated installation video guide, so you can replace your thermostat quickly and safely without needing a mechanic.
Key Features
- Motorcraft Part No: RT-1253 | Ford OEM: 1X4Z-8575-B
- Thermostat gasket included — no need to purchase separately
- Clears fault codes: P0128, P0125
- Factory-set correct opening temperature for 3.5L and 3.7L engines
- Directly compatible OEM replacement part — no modifications required
- Compatible only with 3.5L (non-turbocharged) and 3.7L engines
- Free installation video guide included
Important: This thermostat is NOT compatible with the 3.5L EcoBoost (turbocharged) engine. Please verify your engine type before ordering.
Signs You Need a New Thermostat
- Engine Malfunction Light (P0128 / P0125)
- Engine warms up slowly or runs too cold
- Heater blows cold air
- Low fuel consumption
- Temperature gauge stays consistently low
Vehicle Compatibility (3.5L Non-Turbo and 3.7L Only)
- 2011–2014 Ford F-150 3.7L V6
- 2011–2020 Ford Mustang 3.7L V6
- 2007–2014 Ford Edge 3.5L V6
- 2007–2012 Ford Fusion 3.5L V6
- 2005–2011 Ford Five Hundred/Taurus 3.5L V6
- 2009–2019 Ford Flex 3.5L V6
- 2009–2019 Lincoln MKS/MKT/MKX 3.5L V6
Please verify your engine type and trim level before ordering.
Package Contents
- 1 x Motorcraft RT-1253 Thermostat Assembly
- 1 x Thermostat Gasket
- 🎥 Access to installation video guide
Why Choose SayParts?
We include a free installation video with every order so you can get the job done right the first time. Genuine Motorcraft OEM parts, fast US shipping, and real support when you need it.
✅ Genuine Motorcraft OEM | 📦 Fast US Shipping | 🎥 Free Installation Video | 💰 Best Price Guarantee