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Low Coolant Level & Occasional Overheating in 2021 Aviator

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Mark S. · rep 0 · May 25, 4:31 AM · 1 replies · solved · Question

Vehicle: 2021 Lincoln Aviator Grand Touring

I've got a 2021 Lincoln Aviator Grand Touring with about 45,000 miles. Lately, I've noticed the coolant reservoir seems a bit low, and on a couple of occasions, the temperature gauge has crept up slightly higher than usual, though it hasn't fully overheated. I topped it off once, but it seems to be dropping again.

What type of coolant does my Aviator use? And where should I be checking for leaks? I'm worried about a potential bigger issue. Any tips for a DIY check before I take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:31 AM

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ClearTheCode admin answer:

Experiencing low coolant and rising temperature in your 2021 Lincoln Aviator Grand Touring at 45,000 miles is definitely something to address promptly to prevent serious engine damage.

  1. Coolant Type: Your 2021 Lincoln Aviator requires Motorcraft Orange Antifreeze/Coolant, which is an OAT (Organic Acid Technology) coolant. It's crucial to use the correct type and not mix different coolants, as this can lead to corrosion or gelling. Always use a 50/50 mix of concentrated coolant and distilled water, or purchase pre-mixed.

  2. Common Leak Points to Check (DIY):

    • Radiator: Inspect the fins and tanks for any wet spots or discoloration. Look for drips under the front of the vehicle.
    • Hoses: Check all radiator hoses (upper and lower), heater hoses, and smaller bypass hoses for cracks, bulges, or wetness at connection points. Squeeze them to feel for softness.
    • Water Pump: Look for coolant stains or drips around the water pump pulley area, typically located on the front of the engine.
    • Reservoir Tank: Inspect the coolant expansion tank itself for cracks, especially around seams or hose connections.
    • Engine Block/Heads: While harder to spot, look for any signs of coolant weeping from the engine block or cylinder head areas.
    • Cabin (Heater Core): If you notice a sweet smell inside the car or a foggy windshield, it could indicate a leaking heater core.

  3. How to Check for Leaks:

    • Visual Inspection: With the engine cool, visually inspect all components mentioned above. Use a flashlight for better visibility.
    • Cardboard Test: Park your Aviator over a large piece of clean cardboard overnight. Any drips will be visible in the morning.
    • Pressure Test (Shop Recommended): A professional shop can perform a cooling system pressure test, which will quickly pinpoint most external leaks.

  4. When to See a Shop:

    • Persistent Loss: If you continue to lose coolant after topping off, or if you can't find the source of the leak, professional diagnosis is essential.
    • Overheating: If the temperature gauge goes into the red, pull over safely and shut off the engine immediately. Do not drive an overheating vehicle.
    • No Visible Leak: If there's no external leak, the issue could be an internal head gasket leak, which requires specialized diagnostics and repair.
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