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Overheating concerns: 2020 Aviator Grand Touring coolant system flush

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Mike T. · rep 0 · May 25, 4:31 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Grand Touring

Hi everyone,

I'm experiencing some higher than usual engine temperatures in my 2020 Lincoln Aviator Grand Touring. It's the plug-in hybrid model. I've noticed the temperature gauge creeping up a bit more than usual, especially in traffic or after a longer drive. No warning lights yet, but it's concerning.

I'm wondering if it's time for a coolant flush. I'm at about 65,000 miles. Does anyone know the recommended interval for the Aviator PHEV? Is there a specific type of coolant I should be using? I'm trying to be proactive before it becomes a bigger problem.

Any tips or experiences with cooling system maintenance on these hybrid Aviators would be really helpful!

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

Monitoring your engine temperature is a smart move, especially with a sophisticated hybrid like your 2020 Lincoln Aviator Grand Touring. Overheating can lead to serious engine damage, so addressing it proactively is key.

Here’s a breakdown of what to consider:

  1. Coolant Flush Interval: For most modern Lincoln vehicles, including your Aviator, the recommended coolant service interval is typically around 100,000 miles or 6 years, whichever comes first. However, if you're experiencing higher temperatures, it's wise to consider it sooner. At 65,000 miles, it's a good time for inspection and potentially a flush.
  2. Coolant Type: Your Aviator Grand Touring requires Motorcraft Orange Antifreeze/Coolant (Ford specification WSS-M97B44-D). Using the incorrect type can cause corrosion, damage seals, and lead to cooling system failures. Always use distilled water if mixing concentrate.
  3. Causes of Overheating/High Temps:
    • Degraded Coolant: Over time, coolant loses its anticorrosive properties and heat transfer efficiency.
    • Low Coolant Level: Leaks or evaporation can reduce the coolant level.
    • Thermostat Issues: A faulty thermostat can prevent coolant from circulating properly. This often triggers a P0128 (Coolant Thermostat (Coolant Temperature Below Regulating Temperature)) or similar code.
    • Radiator/Condenser Blockage: External debris or internal clogs can restrict airflow or coolant flow.
    • Water Pump Failure: A failing water pump won't circulate coolant effectively.
    • Cooling Fan Issues: Malfunctioning cooling fans can cause high temps, especially in traffic.
  4. DIY vs. Shop: A coolant flush involves draining the old fluid, flushing the system with water or a cleaning agent, and refilling with new coolant. While possible for a DIYer, ensuring all air is bled from the system (critical for hybrids with multiple cooling loops) and proper disposal of old coolant is important. A professional shop has specialized equipment for a thorough flush and vacuum fill.
  5. When to See a Shop: If after a coolant flush the high temperatures persist, or if you get a 'Check Engine' light with codes like P0128, P0217 (Engine Over Temperature Condition), or P0117 (Engine Coolant Temperature Sensor 1 Circuit Low), it's time for a professional diagnosis. They can perform pressure tests, check sensors, and inspect components like the water pump and thermostat.
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