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2020 Highlander Coolant Flush - What's the right interval?

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Amanda S. · rep 0 · May 22, 2:20 AM · 1 replies · solved · Question

Vehicle: 2020 Toyota Highlander XLE

Hi all, I have a 2020 Toyota Highlander XLE with about 60,000 miles. I've been pretty good about regular maintenance, but I'm wondering about the coolant. I know Toyota uses a specific long-life coolant, but I'm not sure when it's supposed to be replaced.

I haven't noticed any overheating, but I want to be proactive. What's the recommended interval for a coolant flush on these newer Highlanders? Is it something I can do myself, or is it better left to a professional? Also, what type of coolant should I be using?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:20 AM

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ClearTheCode admin answer:

Maintaining your cooling system is crucial for engine longevity, and you're right to be proactive about your 2020 Toyota Highlander. Toyota's Super Long Life Coolant (SLLC) is designed for extended intervals, but it's not truly 'lifetime.'

Recommended Coolant Service Intervals:

  • First Change: Typically around 100,000 miles or 10 years, whichever comes first.
  • Subsequent Changes: Every 50,000 miles or 5 years after the initial change.

Given your 60,000 miles, you're still within the initial interval, but it's good to be aware for future planning.

Why Coolant Flushes are Important:

  1. Corrosion Protection: Over time, the additives in coolant that prevent corrosion and rust break down, leaving engine components vulnerable.
  2. Heat Transfer Efficiency: Degraded coolant can lose its ability to efficiently transfer heat away from the engine, leading to potential overheating.
  3. Preventing Clogs: Old coolant can leave deposits that clog radiator fins and heater cores.

DIY vs. Professional Service:

  • DIY: A coolant drain and fill can be done at home with basic tools. Ensure you use the correct Toyota SLLC (pink/red color) and properly bleed the system to remove air pockets. Improper bleeding can lead to overheating.
  • Professional: A shop can perform a more thorough flush, often using specialized equipment to ensure all old fluid is removed and the system is properly refilled and bled.

Steps for a DIY Drain and Fill (if you choose this route):

  1. Ensure the engine is cool.
  2. Locate and open the radiator drain cock (and engine block drain, if accessible).
  3. Drain old coolant into a suitable container for proper disposal.
  4. Close drains and refill with new Toyota SLLC.
  5. Run the engine with the heater on high and the radiator cap off (or reservoir cap loose) to bleed air. Top off as needed.

When to See a Shop:

  • If you notice any leaks, persistent low coolant levels, or signs of overheating (temperature gauge rising).
  • If you're uncomfortable with the process of draining, refilling, and especially bleeding the system, as air pockets can cause serious engine damage.
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