---
id: faq-0071
title: "What is a coolant flush, and should my Subaru have one?"
category: faq
subtopic: service-and-maintenance
page_type: faq
source_url: "https://www.castlesubarumchenry.com"
tags: ["coolant-flush", "coolant-service", "engine-cooling"]
questions:
  - "Do I need a coolant flush?"
  - "How often should coolant be flushed?"
  - "What does a coolant flush do?"
related: [fluid-checks, maintenance-schedule, winter-maintenance]
dealer: Castle Subaru McHenry
---

Coolant regulates engine temperature and prevents corrosion inside your engine and radiator. Over time, additives break down and particles accumulate, reducing cooling efficiency and potentially damaging engine components.

A coolant flush removes old fluid and replaces it with fresh coolant rated for your Subaru. Most manufacturers recommend a coolant service every 30,000-50,000 miles or per your owner's manual. Skipping it can lead to overheating, rust, and costly repairs.

Castle Subaru McHenry's Service team can check your coolant condition and recommend a flush with genuine Subaru coolant. Call (779) 601-0797 to find out when your Subaru is due for this important service.