Calorstat RC0172 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap for Smart Fortwo

Calorstat RC0172 is a threaded engine coolant reservoir cap built with plastic and rubber for pressurized cooling systems. It is specified for the 2005-2016 Smart Fortwo with a 23 PSI opening pressure, helping maintain the correct pressure level in the coolant reservoir.

Key Features

• Engine coolant reservoir cap for pressurized cooling systems
• Threaded attachment type for secure reservoir fitment
• Plastic and rubber construction
• Opening pressure: 23 PSI
• Maximum pressure rating: 23.0
• Fits 2005-2016 Smart Fortwo, N/A
• Part number RC0172 for application matching

Detailed Description

Calorstat RC0172 is a standard coolant reservoir cap engineered for the Smart Fortwo cooling system. The cap is pressurized and uses a threaded design to seal the reservoir and maintain system pressure at 23 PSI, listed as 1.6 bar in the fitment notes. This pressure control is important for stable coolant operation in the 2005-2016 Smart Fortwo, where the reservoir cap must hold pressure consistently to support normal cooling-system function. This part number RC0172 is also useful when cross-checking replacement needs against OE-style references.

This part cross-references 0003402V003 and 4505010015 for the same application.

Common Issues It Can Address

• Coolant loss from a cap that no longer seals properly
• Pressure-related cooling system warnings
• Reservoir cap leakage around the threaded neck
• Incorrect coolant system pressure retention
• Replacement needs for a worn or damaged Smart Fortwo coolant reservoir cap

Installation Notes and Tips

Verify reservoir neck thread condition before installation and confirm the replacement cap matches the specified 23 PSI rating. Install the cap on a cool engine, tighten it fully by hand, and inspect the reservoir and surrounding hoses for signs of leakage after service. For fitment confirmation, use the vehicle application details for the 2005-2016 Smart Fortwo and compare the original cap specification to RC0172.

Quality Assurance

Calorstat RC0172 is built as a pressurized coolant reservoir cap with the listed material and pressure specifications for the stated Smart Fortwo application. Confirming the part number RC0172 and the 23 PSI rating helps ensure the replacement matches the required cooling-system specification.