How to Coolant Flush and Replacement — 2020-2025 Toyota Highlander

Flushing and replacing the coolant in your 2020-2025 Toyota Highlander is essential to prevent engine overheating and corrosion, especially as part of routine maintenance every 60,000 miles or 5 years. This DIY repair can save you money with parts costing between $30-$50 compared to a shop cost of $100-$150, and with the right tools and steps, most DIYers can tackle it confidently. DIY Cost: $30-$50 | Shop Cost: $100-$150

You’re done. Clear any stored codes with your scanner and complete a normal drive cycle so the vehicle’s readiness monitors reset.

If the code returns, the root cause likely wasn’t the part you replaced — go back through the diagnostic steps before swapping anything else.