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CoolingMedium

Coolant Flush & Refill

Fresh coolant prevents corrosion, maintains proper pH balance, and ensures your engine stays within optimal temperature range year-round.

Time
1–2 hours
Interval
Every 30,000 miles or 2 years
DIY Cost
$20–$50
Shop Cost
$100–$175

Tools & Supplies Needed

Video Guide Coming Soon

Step-by-step video walkthrough for this procedure

Step-by-Step Instructions

1

Wait for the engine to cool completely

Never open a hot cooling system. Wait at least 2 hours after driving, or work on a cold engine. The system is under pressure when hot.

⚠️ Warning: Opening a hot radiator cap can cause boiling coolant to spray, causing severe burns.
2

Drain the old coolant

Place a large drain pan under the radiator petcock (usually at the bottom of the radiator). Open the petcock and let the coolant drain completely.

3

Flush with distilled water

Close the petcock, fill the system with distilled water, run the engine with heat on full for 10 minutes, let it cool, then drain again. Repeat until the water runs clear.

4

Refill with correct coolant mixture

Close the petcock. Fill with a 50/50 mix of the correct coolant type and distilled water. Use a funnel and fill slowly to minimize air pockets.

5

Bleed air from the system

Many vehicles have a bleeder valve on the thermostat housing. Open it while filling until a steady stream of coolant (no bubbles) comes out. Run the engine with the radiator cap off until the thermostat opens.

💡 Pro Tip: Air pockets cause hot spots and overheating. Take your time with this step.