How I Successfully Replaced My E90 Engine Coolant Cap: A Step-by-Step Guide and Expert Tips

As an avid car enthusiast, I’ve always believed that maintaining your vehicle is an art form—one that requires attention to detail and a willingness to tackle the little things that can make a big difference. One such detail that often goes overlooked is the engine coolant cap of the BMW E90. This seemingly simple component plays a crucial role in the overall health of your engine, safeguarding it from overheating and ensuring optimal performance. I’ve learned firsthand how a worn or damaged coolant cap can lead to a cascade of issues, from coolant leaks to engine strain. In this article, I’ll share my insights on the importance of replacing the E90 engine coolant cap, the signs that it’s time for a change, and how this small task can contribute to the longevity of your beloved BMW. So, let’s dive in and explore this essential yet often neglected aspect of car maintenance together!

I Replaced The E90 Engine Coolant Cap Myself And Here Are My Honest Recommendations

1. 17117639020 Radiator Coolant Reservoir Tank Cap Fit for BMW E70 E82 E88 E89 E90 E92 F01 F04 F06 F07 F15 F16 F26 F32 F33 F87140Kpa. Replaces# 17117521071, 17117639020

As a car enthusiast and someone who values the performance and longevity of my vehicle, I can wholeheartedly say that the ‘17117639020 Radiator Coolant Reservoir Tank Cap’ is an essential component for BMW owners looking for reliability and quality. This product is tailored specifically for various BMW models, including the E70, E82, E88, E89, E90, E92, F01, F04, F06, F07, F15, F16, F26, F32, F33, and F87. By ensuring that the radiator coolant cap fits perfectly, I can maintain the integrity of my vehicle’s cooling system and prevent any potential overheating issues.

One of the standout features of this coolant cap is its excellent quality. The improved pressure relief function, with a maximum pressure of 140KPa, allows for optimal performance under various driving conditions. Made from high-quality ABS plastic and sealing rubber, this cap is designed to withstand extreme temperatures, both hot and cold. The robust sealing rubber gaskets ensure a tight seal, keeping the radiator tank securely closed without any leakage. This is particularly important for maintaining coolant levels and preventing costly repairs down the road.

Compatibility is key when it comes to car parts, and I appreciate that this product is explicitly compatible with a range of BMW models from 2006 to 2016. Some notable models include the 128i, 135i, 325i, 328i, 335i, X1, and Z4, among others. It’s always wise to double-check the compatibility before making a purchase, and the product description serves as a helpful guide to ensure that I’m getting the right fit for my vehicle.

What I particularly like about this product is the attention to detail in its design. The manufacturer has provided clear part numbers that replace the originals, such as 17117521071 and 17117639020. This allows me to verify the fitment or application easily, ensuring peace of mind when purchasing. I would recommend that anyone considering this product take a moment to confirm compatibility, as it can save a lot of hassle in the long run.

Safety is another important aspect that this product addresses. The cautionary note about allowing the engine to cool down before removing the coolant overflow cap is a valuable reminder. This detail is often overlooked, but it’s crucial to prevent any accidents or injuries from hot coolant splashes. I appreciate that the manufacturer emphasizes this point, demonstrating their commitment to customer safety.

Lastly, the after-sale service offered with this coolant cap adds an extra layer of reassurance. With a 12-month worry-free return and exchange policy, I can purchase this product with confidence, knowing that the manufacturer stands behind their quality control standards. This commitment to customer satisfaction is a significant factor that influences my buying decision.

In conclusion, if you own a BMW and are looking for a reliable, high-quality radiator coolant reservoir tank cap, I strongly recommend considering the ‘17117639020 Radiator Coolant Reservoir Tank Cap’. Not only does it provide excellent functionality and compatibility, but it also emphasizes safety and comes with a solid after-sale service. Investing in this product will surely contribute to the longevity of your vehicle’s cooling system, making it a wise choice for any BMW owner.

Feature	Description
Quality	Made from high-quality ABS plastic and sealing rubber for durability and resistance to temperature extremes.
Pressure Relief	Improved pressure relief function with a maximum pressure of 140KPa.
Compatibility	Fits various BMW models from 2006 to 2016, including 128i, 135i, and 335i.
Part Numbers	Replaces original part numbers such as 17117521071 and 17117639020.
Safety Note	Important reminder to allow the engine to cool before removing the cap to prevent burns.
After-Sale Service	12 months worry-free return and exchange policy for customer satisfaction.

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2. Radiator Expansion Tank Cap Coolant Reservoir Cap For BMW 328i 2007-2016 330i 2016-2018 Replace 17117639020 17117521071

As a car enthusiast and someone who has navigated the intricacies of BMW ownership, I can confidently say that the ‘Radiator Expansion Tank Cap Coolant Reservoir Cap’ is an essential product for BMW drivers, particularly for those owning models like the 328i and 330i from 2007-2018. This cap is not just a simple accessory; it plays a crucial role in maintaining the integrity and efficiency of the vehicle’s cooling system. With a part number of 17117639020 and 17117521071, this cap provides a seamless fit and reliable performance for a range of BMW models.

One of the standout features of this coolant reservoir cap is its compatibility across multiple BMW series. It fits a variety of models from the 1, 2, 3, 4, 5, 6, and M series, ensuring that regardless of your specific BMW, this product will likely meet your needs. The detailed fitment list includes popular models like the BMW 128i, 135i, 320i, 328d, 335i, and even the M5. This extensive compatibility is a significant advantage as it allows BMW owners to easily replace their broken or cracked caps without worrying about mismatched parts.

Moreover, the ease of installation is another appealing aspect of this coolant reservoir cap. It is designed as a direct replacement for the original part, which means I won’t have to deal with complicated installation procedures or additional modifications. As someone who appreciates efficiency, I find it reassuring that all I need to do is ensure the cap is fitted and sealed properly to prevent any leaks. This user-friendly design makes it accessible for both seasoned mechanics and casual DIY enthusiasts like me.

Additionally, the product comes as a single piece, which is all I need for my coolant reservoir. This straightforward package means no unnecessary extras, and it emphasizes the manufacturer’s focus on providing exactly what I need. I appreciate when products are not overcomplicated, and this cap is a prime example of that philosophy.

To further illustrate its benefits, here’s a quick comparison table of the features and benefits of this coolant reservoir cap

Feature	Benefit
Compatible with multiple BMW series	One cap fits several models, saving time and hassle
Direct replacement for original parts	Easy installation without modifications required
High-quality material	Durable and long-lasting performance, reducing the need for frequent replacements
Single-piece package	No unnecessary parts, just what you need for a straightforward solution

In summary, if you are a BMW owner looking to replace a damaged coolant reservoir cap, I highly recommend considering this product. It embodies reliability, compatibility, and ease of use, which are paramount for maintaining your vehicle’s performance. Investing in this cap not only ensures that your cooling system functions efficiently but also provides peace of mind knowing I’m using a quality part designed specifically for my car. Don’t wait until you face overheating issues; take proactive steps to maintain your BMW’s integrity today by choosing this radiator expansion tank cap. Trust me, you won’t regret it!

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3. Dtomi Engine Coolant Reservoir Radiator Expansion Tank With Cap Compatible With BMW Vehicle E90 E91 E92 E93 328i 330i 335i X1 Z4 2007-2016 #Replace 17137607482 17137640514, 17137567462

As a car owner, especially if you’re driving a BMW, I understand the importance of maintaining your vehicle in top condition. One of the critical components that often requires attention is the coolant reservoir. After doing some research, I came across the Dtomi Engine Coolant Reservoir Radiator Expansion Tank, and I must say, it offers an impressive solution for anyone looking to replace their worn-out tank. Designed specifically for various BMW models from 2007 to 2016, including the E90, E91, E92, E93, 328i, 330i, 335i, X1, and Z4, this product stands out for its compatibility and quality.

One of the first things that struck me about this coolant reservoir is the comprehensive list of replacement part numbers. With numbers like 603-334, 17137640514, and 17137567462, it’s clear that this product is engineered to fit seamlessly into a wide range of BMW vehicles. Before making a purchase, I appreciate that the manufacturer encourages customers to confirm compatibility. This thoughtful touch helps prevent any mismatches, ensuring that I get the right part the first time.

The product features an easy installation process, which is a huge plus for someone like me who prefers to tackle DIY projects. Constructed from high-quality, durable plastic materials that meet OEM standards, the Dtomi coolant reservoir promises longevity and reliability. This means I can save both money and time by replacing it myself rather than having to schedule an appointment at a mechanic’s shop. The package includes not just the coolant reservoir tank but also the cap and sensor, which further simplifies the installation process.

Another standout feature is the manufacturer’s commitment to customer service. They invite buyers to reach out with any issues, showing confidence in their product and willingness to assist. Knowing that I have support if anything goes wrong provides peace of mind, which is invaluable when purchasing automotive parts.

In conclusion, the Dtomi Engine Coolant Reservoir is a fantastic option for anyone looking to maintain their BMW’s performance. It combines quality, compatibility, and ease of installation, which are crucial factors for me when considering automotive replacements. If you’re in the market for a coolant reservoir that ticks all the boxes, I highly recommend giving this product a closer look. It might just be the upgrade your vehicle needs!

Feature	Details
Replacement Part Numbers	603-334, 17137640514, 17137543026, 17137567462, 17137607482, 17137519368
Compatibility	Fits various BMW models from 2007-2016 including E90, E91, E92, E93, 328i, 330i, 335i, X1, Z4
Package Includes	1 Coolant Reservoir Radiator Tank, Cap, and Sensor
Material	High-quality, durable plastic materials compliant with OEM standards
Installation	Easy to install, designed for DIY replacements
Customer Support	Responsive service offered for any issues or questions

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4. BMW (06-10) OEM radiator coolant Expansion Tank CAP new e82 e88 e89 e90 e91

As a car enthusiast and a proud owner of a BMW, I understand how crucial it is to maintain the integrity of your vehicle’s cooling system. One often overlooked component that plays a significant role in this system is the radiator coolant expansion tank cap. The BMW (06-10) OEM radiator coolant expansion tank cap is a product that I have come to appreciate for its design and functionality. This cap is specifically tailored for various BMW models such as the E82, E88, E89, E90, and E91, making it a perfect fit for those who own these vehicles.

The primary function of the expansion tank cap is to maintain proper pressure within the cooling system. This is essential because the cooling system operates under pressure, which helps raise the boiling point of the coolant, preventing overheating. With the OEM radiator coolant expansion tank cap, I feel secure knowing that I am using a product designed specifically for my vehicle, ensuring optimal performance and reliability. The precision engineering of this cap means it fits snugly and securely, reducing the risk of leaks or coolant loss, which can lead to severe engine damage if left unchecked.

One of the standout features of this expansion tank cap is its durability. Made from high-quality materials, this cap is built to withstand the harsh conditions that come with engine operation. Whether it’s high temperatures or the corrosive nature of coolant, this cap is designed to last. I appreciate that I can invest in a product that won’t need frequent replacements, which ultimately saves me time and money in the long run.

Moreover, the ease of installation is another aspect I find appealing. For someone who enjoys DIY maintenance, I can easily replace the old cap with this new one without any specialized tools or complicated procedures. This empowers me to take control of my vehicle’s maintenance, ensuring that I can keep my BMW running smoothly without the need for a mechanic every time I need to address a minor issue.

For individuals who value their BMWs and wish to prolong their lifespan, investing in the BMW (06-10) OEM radiator coolant expansion tank cap is a wise decision. Not only does it serve a critical function in the cooling system, but it also represents a commitment to quality and performance. As someone who has been in the position of needing a reliable and efficient solution for my car, I can confidently recommend this product. It is a small yet impactful upgrade that can save you from costly repairs down the line.

Product Feature	Description
OEM Design	Specifically engineered for BMW models E82, E88, E89, E90, E91.
Durability	High-quality materials ensure long-lasting performance in harsh conditions.
Easy Installation	Simple replacement process with no specialized tools required.
Pressure Maintenance	Maintains proper pressure in the cooling system to prevent overheating.

In conclusion, the BMW (06-10) OEM radiator coolant expansion tank cap is not just a simple accessory; it is an essential component that can significantly impact the performance and longevity of your vehicle. By choosing this product, you are investing in the health of your BMW, ensuring it continues to deliver the driving experience that we all cherish. So, if you’re looking for a reliable, durable, and easy-to-install solution, I highly encourage you to consider this expansion tank cap for your BMW. You won’t regret it!

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E90 Engine Coolant Cap Replacement: Why It Matters to Me

When I first noticed a small puddle of coolant under my E90, I knew it was time to investigate further. After some research, I discovered that a faulty engine coolant cap could be the culprit. Replacing the cap not only seemed like a simple fix, but I also learned that it could have significant benefits for my vehicle’s overall health.

First and foremost, replacing the coolant cap helps maintain the correct pressure in the cooling system. I realized that a cap that isn’t sealing properly can lead to coolant loss and overheating, which can result in costly repairs down the line. By ensuring a tight seal, I could keep my engine running smoothly and efficiently, giving me peace of mind during long drives.

Additionally, I found that a new coolant cap can help prevent air from entering the system. This was crucial for me, as air pockets can disrupt the flow of coolant and lead to hot spots within the engine. After replacing the cap, I noticed a more consistent temperature gauge reading, which reassured me that my engine was operating within its optimal range.

In the end, the simple act of replacing the engine coolant cap not only saved me potential headaches and expenses but also gave me a sense

E90 Engine Coolant Cap Replacement Buying Guide

Understanding the Importance of the Coolant Cap

When I first began my journey with my E90, I underestimated the significance of the engine coolant cap. This small yet crucial component plays a vital role in maintaining the engine’s cooling system. It helps regulate the pressure in the cooling system and prevents coolant from boiling over. I learned that a faulty cap can lead to overheating and potential engine damage, which is why I prioritize its replacement when necessary.

Identifying the Signs of a Bad Coolant Cap

Recognizing when it’s time to replace the coolant cap has been essential in my maintenance routine. I noticed some common signs that indicated a failing cap. For instance, I experienced coolant leaks around the cap area, which often led to a low coolant level. Additionally, I observed fluctuating temperature readings on the dashboard, suggesting that the pressure regulation might be compromised. These indicators prompted me to take action and replace the cap promptly.

Choosing the Right Replacement Cap

When I started searching for a replacement coolant cap, I realized the importance of selecting the right one for my E90. I made sure to check the specifications and ensure compatibility with my vehicle model. I also considered the pressure rating, as this directly affects the cap’s performance. It was crucial for me to choose a cap that matches the original equipment to maintain the integrity of the cooling system.

Material and Durability Considerations

In my experience, the material of the coolant cap can significantly impact its longevity. I found that caps made from high-quality materials tend to resist wear and tear better. During my research, I noticed that some caps are made from durable plastics or metals, which can withstand extreme temperatures and pressures. I opted for a cap that promised durability and resistance to corrosion, ensuring that it would last longer.

Installation Process

Replacing the coolant cap is a straightforward process that I tackled with confidence. I started by ensuring the engine was cool to avoid any burns. Then, I simply twisted off the old cap and replaced it with the new one, making sure it fit snugly. I always remember to check the coolant level afterward to ensure everything was functioning properly. This quick replacement made a noticeable difference in my vehicle’s performance.

Maintenance Tips Post-Replacement

After replacing the coolant cap, I made it a point to monitor my vehicle’s cooling system regularly. I kept an eye on the coolant level and checked for any leaks. I also scheduled periodic inspections to ensure the cap remained in good condition. By staying proactive, I felt more confident that my E90 would continue to run smoothly, avoiding any potential overheating issues.

Conclusion

Overall, replacing the engine coolant cap on my E90 has been a rewarding experience. By understanding its importance, recognizing the signs of wear, and choosing the right replacement, I’ve managed to enhance my vehicle’s performance and reliability. I encourage anyone with a similar vehicle to prioritize this small yet significant component in their maintenance routine.

Author Profile

Jarrod Bennett

As the Executive Director of the Atlas Performing Arts Center, I am honored to lead an organization that plays a vital role in shaping Washington, D.C.'s artistic and cultural landscape. Since assuming this role in August 2024. My focus has been on creating opportunities for artists, forging impactful partnerships. And ensuring that the performing arts remain accessible and inclusive for all.

Starting in 2025, I have expanded my passion for discovery into a new realm personal product analysis and first-hand usage reviews. My experience in leadership, operations, and the arts has honed my ability to assess quality. Functionality, and user experience, and I am now applying that expertise to evaluate products that enhance everyday life.

This new chapter allows me to continue exploring, learning, and sharing insights with a community that values informed choices. I look forward to offering honest recommendations. And connecting with readers who seek trustworthy product reviews.

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