How to Coolant Flush and Replacement — 2010-2025 Toyota 4Runner

Flushing and replacing the coolant in your 2010-2025 Toyota 4Runner 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, costing around $30-$50 for parts compared to $100-$150 at a shop, and with the right tools and guidance, 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.