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Low Coolant Level and Engine Running Hot on 2023 CX-30 - Coolant Flush?

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Mike T. · rep 0 · May 25, 3:36 AM · 1 replies · solved · Question

Vehicle: 2023 Mazda CX-30 Premium

Hi everyone, I've got a 2023 Mazda CX-30 Premium with the 2.5L turbo engine, and it only has about 18,000 miles on it. Yesterday, I noticed the engine temperature gauge was a bit higher than usual, and when I checked under the hood, the coolant reservoir was almost empty! I topped it off with some universal coolant I had, but it got me thinking about proper coolant maintenance.

Is it normal for a relatively new car to have low coolant like this? Could there be a leak, or is it just evaporation? What's the recommended coolant type and flush interval for these newer Skyactiv-G engines? I want to make sure I'm taking care of it properly, especially with the turbo.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:36 AM

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ClearTheCode admin answer:

Finding your coolant reservoir almost empty on a 2023 Mazda CX-30 with only 18,000 miles is definitely cause for concern and is not normal for such a new vehicle. While some minor evaporation can occur over years, a significant drop in coolant level indicates a potential issue that needs immediate attention. Running an engine hot, especially a turbocharged one, can lead to severe and costly damage.

Here's a breakdown of what you should do and consider:

  1. Identify the Cause of Low Coolant:

    • External Leak: This is the most common reason. Inspect all hoses, the radiator, water pump, and heater core connections for any signs of drips, stains, or residue. A pressure test of the cooling system by a professional can quickly pinpoint external leaks.
    • Internal Leak: Less common but more serious. This could be a head gasket leak, allowing coolant to burn in the combustion chambers or mix with engine oil. Look for white smoke from the exhaust, milky oil on the dipstick, or bubbles in the coolant reservoir (with the engine running and cap off).
    • Faulty Radiator Cap: A failing radiator cap can lose pressure, leading to coolant evaporation and potential overheating. It's a cheap and easy component to replace.

  2. Correct Coolant Type:

    • Crucial: Mazda Skyactiv engines require a specific type of coolant, typically a FL22 Long-Life Coolant. This is an Ethylene Glycol-based, phosphate-free, silicate-free, and nitrite-free coolant, usually green or blue in color. Using 'universal' coolant or mixing different types can lead to corrosion, premature component failure, and void your warranty. You should drain and properly fill with the correct FL22 coolant as soon as possible.

  3. Coolant Flush Interval:

    • For Mazda vehicles using FL22 coolant, the initial replacement interval is very long – often 10 years or 120,000 miles. However, this assumes no issues like leaks or contamination. Given your situation, a full system flush and refill with the correct FL22 coolant is highly recommended after the leak source is identified and repaired.

When to See a Shop:

  • Immediately: Do not drive the car extensively until the cause of the coolant loss is found and fixed. Overheating can warp cylinder heads, damage gaskets, and lead to total engine failure.
  • A professional mechanic can perform a cooling system pressure test, inspect for leaks, and ensure the system is properly bled and refilled with the correct coolant. They can also diagnose if the high temperature was due to the low coolant or another underlying issue (e.g., thermostat, water pump).
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