Coolant Thermostat - Quinton Hazell - QTH487
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Product Information
Full details
The Quinton Hazell QTH487 Coolant Thermostat is designed for automotive enthusiasts and DIY mechanics who prioritize precise engine temperature regulation to prevent overheating and ensure efficient performance. This unit is engineered to open at exactly 82 degrees Celsius, maintaining optimal thermal stability during operation. A key caveat for installers is that this specific part does not include a gasket or seal, so users must ensure they have the correct replacement hardware on hand before beginning the installation process.
All features
| Model Part Number | QTH487 |
|---|---|
| Brand | Quinton Hazell |
Extended Product Information
FAQs
What is the opening temperature of the QTH487?
This thermostat is calibrated to open at 82 degrees Celsius.
Does this thermostat come with a gasket?
No, the QTH487 is sold as the unit only and does not include a gasket or seal.
How do I ensure this fits my car?
You should check your vehicle's manual or use an online compatibility checker using the MPN QTH487 against your specific car model and year.
What are the physical dimensions of this thermostat?
The unit is 33 mm in height with diameters of 48 mm and 28 mm.
Is it difficult to install?
It is a standard mechanical task, but it requires draining the cooling system and bleeding air, so basic mechanical knowledge is recommended.
Troubleshooting
Engine temperature remains low or fluctuates
The thermostat may be stuck in the open position; verify that the unit is seated correctly and inspect for debris in the cooling system.
Engine overheating shortly after installation
Air may be trapped in the cooling system; ensure you have fully bled the system according to your vehicle's service manual.
Coolant leak around the housing
Ensure a new, correct gasket or seal was used; the QTH487 does not include one, and re-using an old seal is not recommended.
Pros and Cons
Pros
- Strict 82-degree Celsius opening threshold
- High-quality build matching OEM standards
- Compact dimensions for versatile application
- Reliable manufacturer reputation
Cons
- Gasket or seal not included in the box
- Requires professional verification for vehicle fitment
- Installation requires draining the cooling system
Setup, Compatibility & Care
Before installation, use an online parts database to verify that the QTH487 is compatible with your specific vehicle's engine code and make. The installation process involves draining the existing coolant, removing the thermostat housing, and replacing the old unit. Because this package does not include a gasket or seal, you must source the correct housing seal separately to prevent leaks. Always refill the system with the manufacturer-recommended coolant mix and perform a proper air-bleed procedure to ensure no pockets of air remain in the system, which can cause false temperature readings.