1
Cool the engine completely
Never open a hot radiator or coolant cap — the system is pressurized and can spray scalding coolant. Wait until the engine is cool to the touch.
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2014–2018 GMC Sierra 1500
2014-2018 GMC Sierra 1500 - Coolant Flush
🔧🔧 Moderate
1 hour
$30 DIY
Save $90 by doing it yourself! Shop cost: $120
Quick Video Tutorial
Parts You Need
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Total Cost
$28.00
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Coolant (spec type and quantity) | — | $28.00 |
About prices: shown prices are estimates from typical Amazon listings and change frequently, and cheaper alternatives may be available. Confirm the current price on Amazon before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
2
Drain the old coolant
Place a drain pan under the radiator drain petcock. Open it and let the old coolant drain fully. Open the radiator cap to speed the flow.
3
Flush with distilled water
Close the drain, fill the radiator with distilled water, run the engine with the heater on full until it reaches operating temp, then drain again. Repeat until the water runs clear.
4
Fill with new coolant
Close the drain. Fill the radiator and overflow tank with the correct coolant mix (or pre-mixed) to spec. Use the exact type your vehicle requires — do not mix colors.
5
Bleed air and check the level
Run the engine with the cap off until the thermostat opens (upper hose gets hot). Top off as needed. Replace the cap and check the overflow level after a drive.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Opening a hot radiator cap
- • Using the wrong coolant type
- • Not bleeding air from the system
- • Mixing coolant colors (e.g., green with orange)
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