Menu
Cancel

Browse over 9,000 car reviews

    Sorry, there are no models that match your search

  • guides

    adventureguide

    familyguide

    tradieguide

    urbanguide

    • 0 Manage My Ad Logout

    Browse over 9,000 car reviews

    Sorry, there are no cars that match your search

    Why is the coolant system on my 2004 BMW 525i losing pressure?

    Asked by Chady

    I've installed a new coolant tank on my 2004 BMW 525i. I've used a diagnostic tool to determine it is losing pressure. What are the common problems? Is this one of them?

    Answered by CarsGuide

    18 Sep 2020 David Morley

    Did you replace the coolant tank because the vehicle was losing coolant in the first place? If so, there’s a chance that even though the coolant tank is brand new, there could be a leak from somewhere else in the system (that’s allowing the system to lose pressure, as you’ve identified). Possibilities include the radiator itself or even a head gasket, not to mention any one of a number of plastic fittings that control the flow of coolant to the engine and the car’s heating system. But don’t rule out the simple stuff, either; even the humble radiator cap or loose hose-clamp can allow pressure to leak from a cooling system.

    The problem with a lot of imported cars is that they tend to use lots of plastic components in their plumbing systems. As they age (and at 16 years old, your car is hardly in the first flush of youth) these fittings and couples become brittle and can begin to leak or even fall apart altogether. In colder climates, these plastic bits and pieces don’t present the same problems to the same degree, but here in Australia, our hot-climate heat-cycles are not appreciated by some makes and models. Combine that with a modern, pressurised cooling system, and you have yourself a problem.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

    Other BMW 525i problems

    SEE ALL BMW 525I PROBLEMS

    How can we help?

    Please note: Questions cannot be answered privately. All answers will be published on CarsGuide.com.au

    By clicking on the 'Submit' button you acknowledge you have read and agree to abide by the CarsGuide Terms & Conditions and Privacy Policy. Carsguide reserves the right to not answer any questions for any reason. You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice.
    View cars for sale

    Over 8,000 questions answered by CarsGuide

    Search

    Complete Guide to BMW
    525I

    Reviews, price, specs and more

    Most viewed in advice

    1. 10 best hybrid vehicles in Australia

    2. 10 cheapest new cars for sale in Australia

    3. 10 of the most reliable used cars in Australia

    4. Best 10 Vehicles for Towing

    5. Best small cars under $20,000

    6. Vehicle weights explained | tare, kerb, GVM, payload and trailer figures

    7. When to use low range in your 4x4

    8. Top 10 SUVs in Australia: The definitive list

    9. Fuel efficiency explained

    10. What's the difference between diesel and petrol cars?

    Comments