MOTORCRAFT RH-308 Thermostat Cooling Kit

( Brand: Motorcraft ), ( Manufacturer Part Number: RH-308 ), ( Part Type: Thermostat )

Review MOTORCRAFT Thermostat Cooling Kit

The **Motorcraft RH-308 Thermostat Cooling Kit** is a high-performance, precision-engineered solution designed to optimize engine cooling efficiency and reliability in Ford vehicles equipped with the iconic 5.0L Coyote engine, including models like the Mustang GT, F-150 Raptor, and EcoBoost-powered trucks. This kit is meticulously crafted to address the critical role of thermostat function in maintaining optimal operating temperatures, ensuring peak performance, fuel efficiency, and longevity of the cooling system. At its core, the RH-308 kit features a **high-quality, durable thermostat** with a **precision-machined valve assembly**, engineered to open at the exact temperature range specified for your engine typically around **195 F (90 C)** to regulate coolant flow and prevent overheating while minimizing idle enrichment. The thermostat is constructed from **high-grade stainless steel and corrosion-resistant materials**, making it resistant to warping, cracking, or premature failure, even under the extreme thermal and mechanical stresses of high-performance driving or towing applications.

Complementing the thermostat is a **sealed, high-flow thermostat housing**, designed to provide a secure and leak-free connection to the engine s cooling system. This housing is engineered with **O-ring seals and precision-molded gaskets** to ensure a tight, vibration-resistant fit, preventing coolant leaks that could compromise engine performance or lead to costly repairs. The kit also includes a **replacement thermostat housing gasket**, which is crafted from **high-temperature-resistant elastomers** to maintain its integrity under extreme heat and pressure, further enhancing the reliability of the cooling system. For added convenience and ease of installation, the kit is packaged with **clear, step-by-step instructions**, along with all necessary hardware, including a **new thermostat housing bolt** and **anti-seize compound** to prevent seizing during installation a common issue in high-heat environments.

Beyond its core components, the **Motorcraft RH-308 Thermostat Cooling Kit** is a testament to Ford s commitment to quality and compatibility, as it is **directly engineered and tested** to meet or exceed OEM specifications, ensuring seamless integration with your vehicle s cooling system. Whether you re restoring an older Mustang, upgrading a high-performance truck, or simply maintaining your vehicle s cooling system for long-term reliability, this kit provides a **cost-effective, hassle-free solution** that eliminates the guesswork of aftermarket alternatives. By investing in this kit, you re not only safeguarding your engine from the risks of overheating such as warped cylinder heads, blown head gaskets, or coolant system failures but you re also ensuring that your vehicle operates at its intended performance levels, delivering **smooth acceleration, consistent power delivery, and extended engine life**. Perfect for both professional mechanics and DIY enthusiasts, the **Motorcraft RH-308 Thermostat Cooling Kit** is an essential upgrade for anyone serious about preserving the health and efficiency of their Ford s cooling system.

The **Motorcraft RH-308 Thermostat Cooling Kit** is designed for Ford engines (commonly found in models like the F-150, Explorer, and Mustang) and includes a thermostat, housing, and associated cooling components. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Motorcraft RH-308 Thermostat Cooling Kit**

1. **OEM Quality and Reliability**

The Motorcraft brand is Ford s official equipment manufacturer, meaning the parts are engineered to meet or exceed Ford s specifications. This ensures compatibility, durability, and performance aligned with the manufacturer s standards. OEM parts are less likely to fail prematurely compared to aftermarket alternatives, especially in critical components like thermostats.

2. **Direct Fitment and Simplicity**

The kit is designed as a direct replacement for the stock thermostat and housing in compatible Ford engines. This eliminates the need for modifications or additional adapters, making installation straightforward for mechanics with basic tools. The kit typically includes the thermostat, housing gasket, and sometimes a bypass hose or other minor components, reducing the risk of missing parts.

3. **Thermal Efficiency and Engine Protection**

A properly functioning thermostat regulates engine temperature within the optimal range (typically 195 220 F for most Ford engines). The RH-308 kit is designed to open at the correct temperature, preventing overheating and reducing wear on the engine, water pump, and cooling system. This is particularly important for high-performance or heavily loaded engines where overheating can cause severe damage.

4. **Compatibility with Ford s Cooling System**

The kit integrates seamlessly with Ford s cooling system, including the radiator, water pump, and hoses. This ensures proper coolant flow and temperature regulation, which is critical for longevity. The housing is often made of durable materials (e.g., aluminum or plastic) that resist warping or cracking over time.

5. **Warranty Coverage**

As an OEM part, the Motorcraft RH-308 kit may come with Ford s warranty (varies by dealer or purchase location), providing peace of mind against defects. This can be advantageous if the part fails within the warranty period.

6. **Prevents Coolant Leaks**

The housing gasket in the kit is designed to seal properly, reducing the risk of coolant leaks a common issue with aftermarket thermostats or worn-out gaskets. Leaks can lead to coolant loss, overheating, and corrosion in the cooling system.

7. **Supports Engine Performance**

A faulty thermostat can cause the engine to run too hot or too cold, leading to inefficient combustion, reduced fuel economy, or even engine damage. The RH-308 kit ensures the engine operates within its ideal temperature range, supporting performance and longevity.

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### **Cons of the Motorcraft RH-308 Thermostat Cooling Kit**

1. **Higher Cost Compared to Aftermarket Options**

OEM parts like the Motorcraft kit are generally more expensive than aftermarket alternatives. For example, while the Motorcraft thermostat may cost $50 $80, a comparable aftermarket thermostat could range from $10 $30. This can be a significant drawback for budget-conscious consumers or those replacing multiple components.

2. **Limited Availability Outside Ford Dealerships**

The kit may not be as widely stocked in independent auto parts stores or online retailers compared to aftermarket brands (e.g., ACDelco, Fram, or Gates). This could require purchasing through a Ford dealer, which may have higher prices or longer wait times.

3. **Potential for Overkill for Minor Repairs**

If the issue is not related to the thermostat (e.g., a failing water pump, radiator, or coolant leak), replacing the entire kit may be unnecessary. In such cases, opting for a standalone thermostat or addressing the root cause could save money.

4. **Installation May Require Draining Coolant**

Replacing a thermostat typically involves draining the cooling system, which can be time-consuming and messy. While the kit simplifies the process, it doesn t eliminate the need for proper coolant disposal and refilling, which may not be ideal for DIYers without the right tools or experience.

5. **Mixed Reviews on Longevity in Some Cases**

While Motorcraft parts are generally reliable, some users report that the thermostat or housing may wear out faster than expected in high-mileage or heavily used vehicles. This is less common than with aftermarket parts but worth considering if the vehicle has significant history or operates under extreme conditions (e.g., towing, off-roading).

6. **No Upgrades for Performance Engines**

The RH-308 kit is designed for stock or mildly modified engines. If you re running a high-performance turbocharged or supercharged engine, the stock thermostat may not be sufficient, and a performance-grade thermostat (e.g., with a higher opening temperature) might be necessary. The Motorcraft kit won t accommodate such upgrades.

7. **Potential for Gasket Failure Over Time**

While the gasket in the kit is designed to seal well, it can degrade over time due to heat, coolant contamination, or improper installation. This could lead to leaks, requiring additional maintenance or replacement.

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### **Conclusion**

The **Motorcraft RH-308 Thermostat Cooling Kit** is a high-quality, reliable choice for Ford owners who prioritize OEM compatibility, durability, and peace of mind. It excels in thermal regulation, engine protection, and long-term performance, making it ideal for stock or lightly modified vehicles. However, its higher cost, limited availability, and the need for professional installation (or careful DIY work) may deter budget-conscious buyers or those seeking aftermarket alternatives.

For most Ford owners experiencing thermostat-related issues (e.g., overheating, slow warm-up, or coolant leaks), the Motorcraft kit is a **strong recommendation** due to its reliability and direct fitment. If cost is a major concern, a reputable aftermarket thermostat (e.g., ACDelco or Fram) with positive reviews could be a viable alternative, provided the vehicle s cooling system is otherwise healthy.

- You want OEM quality and warranty coverage.

- Your vehicle is stock or mildly modified.

- You re comfortable with the higher cost for long-term reliability.

- You re replacing the thermostat as part of a routine maintenance or known issue.

- You re on a tight budget and the vehicle s cooling system is otherwise in good condition.

- You re replacing only the thermostat (not the housing) and have a trusted brand (e.g., ACDelco, Fram).

- You re working with a high-mileage vehicle where aftermarket parts have proven reliable in your experience.

For most cases, the Motorcraft kit is the **best choice for performance, longevity, and compatibility**, but weigh the cost against your specific needs. Always pair the replacement with a coolant flush and inspection of the cooling system for optimal results.

Details:

The Motorcraft RH-308 is an OE/OEM engine cooling component designed for use in cars and trucks. As a genuine part manufactured by Motorcraft, this product ensures quality and compatibility with the specified vehicle model's.

part #: rh308 prices

• $28.06-$274.95

specifications ocoosys:

• brand: Motorcraft
• mpn: Rh-308
• part type: Thermostat

offer ocoosys:

• sold: 0
• options: Ship-to-home
• started: March 20, 2026
• quantity: 1
• best offers: True
• availability: In Stock

seller ocoosys:

• # reviews: 0
• rating: 0.0%
• city: Grosse Ile, Michigan

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

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• transit: 5-11 Days
• cost: $5.07
• service: USPS Ground Advantage
• type: Calculated

returns ocoosys:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

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• credit card: Diners-club

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