Water Bottle Caps (Coolant Expansion Tanks)
For top-quality Mercedes spares and Mercedes Benz spare parts in Johannesburg, visit M&B Parts. We have got your Mercedes covered with a wide range of genuine parts to keep your vehicle running smoothly.
Mercedes-Benz Coolant Expansion Tank Caps
M&B Parts supplies high quality Mercedes-Benz coolant expansion tank caps designed to maintain correct cooling system pressure and prevent coolant loss. A properly functioning expansion tank cap is essential for regulating coolant boiling point and ensuring stable engine temperatures.
We stock water bottle caps for a wide range of Mercedes-Benz models, offering correct pressure ratings, durable sealing, and reliable long term performance.
Water Bottle Caps for Mercedes-Benz Cooling Systems
The coolant expansion tank cap seals the cooling system and controls internal pressure. It allows excess pressure to be released safely while maintaining the correct operating pressure required for efficient engine cooling.
Using an incorrect or worn expansion tank cap can cause coolant leaks, overheating, or false low coolant warnings, even when other cooling components are in good condition.
What Does a Mercedes Coolant Expansion Tank Cap Do
Mercedes expansion tank caps contain a pressure relief valve that raises the coolant boiling point by maintaining system pressure. This allows the engine to operate at higher temperatures without coolant boiling or escaping.
Over time, seals inside the cap can weaken, and pressure valves can fail, making the cap a common and often overlooked cause of cooling system problems.
Common Signs of a Faulty Expansion Tank Cap
A failing coolant expansion tank cap may present one or more of the following symptoms:
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Coolant loss with no visible leaks
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Coolant overflow from the expansion tank
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Low coolant warning messages
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Engine overheating under load
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Hissing sounds from the expansion tank
Replacing a faulty cap is a simple and cost effective way to restore proper cooling system operation.
Genuine and OEM Mercedes Expansion Tank Caps
M&B Parts supplies a carefully selected range of expansion tank caps, including:
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Genuine Mercedes-Benz coolant expansion tank caps
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OEM-equivalent caps manufactured to original pressure specifications
All caps are selected for correct pressure rating, seal quality, and compatibility with Mercedes-Benz cooling systems.
Mercedes Models and Expansion Tank Cap Compatibility
Our expansion tank caps are suitable for many Mercedes-Benz models, including A-Class, B-Class, C-Class, E-Class, CLA, GLA, ML, GLE, and additional passenger and SUV models.
We reference Mercedes part numbers to ensure correct pressure rating and fitment. If you are unsure which expansion tank cap fits your vehicle, our team can assist before purchase.
Why Buy Mercedes Expansion Tank Caps from M&B Parts
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Mercedes-Benz cooling system specialists
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High quality genuine and OEM replacement caps
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Competitive pricing without compromising reliability
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Nationwide delivery across South Africa
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Experienced support to help you choose the correct part
We focus on supplying cooling system components that meet Mercedes-Benz standards and real world operating conditions.
Need Help Choosing the Correct Expansion Tank Cap
If you cannot find the correct coolant expansion tank cap for your Mercedes-Benz, contact M&B Parts with your vehicle details or part number. Our team will assist in sourcing the correct component.
You may also explore related categories such as coolant expansion tanks, radiators, thermostats, or water pumps to complete your cooling system repair.
Frequently Asked Questions
Can a faulty expansion tank cap cause overheating?
Yes. If the cap cannot maintain correct pressure, coolant can boil or escape, leading to overheating.
How often should a Mercedes coolant expansion tank cap be replaced?
Caps should be replaced if seals are worn, pressure is not maintained, or cooling issues persist with no visible leaks.
Are OEM expansion tank caps safe for Mercedes vehicles?
Yes. OEM-equivalent caps manufactured to Mercedes specifications provide correct pressure regulation and reliable sealing.
Do you deliver Mercedes expansion tank caps nationwide?
Yes. M&B Parts offers nationwide delivery across South Africa.