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2017 LaCrosse Overheating - What Coolant Type and Flush Interval?

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Dan C. · rep 0 · May 22, 3:53 AM · 1 replies · solved · Question

Vehicle: 2017 Buick LaCrosse Premium

Hi all,

I've got a 2017 Buick LaCrosse Premium with about 80,000 miles. Recently, I've noticed the temperature gauge creeping up a bit higher than usual, especially in stop-and-go traffic. It hasn't fully overheated, but it's concerning.

I'm thinking it might be time for a coolant flush. What's the recommended coolant type for these LaCrosses, and what's the typical flush interval? I want to make sure I use the right stuff and don't cause any more problems.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:53 AM

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Hello Emily,

Your concern about the temperature gauge creeping up on your 2017 Buick LaCrosse at 80,000 miles is valid, and a coolant flush is a great place to start. Here's what you need to know:

Importance of Coolant Maintenance:

  • Over time, coolant degrades, losing its anti-corrosion properties and its ability to effectively transfer heat. This can lead to engine overheating and damage to cooling system components.
  • Contaminated coolant can also cause blockages in the radiator or heater core.

Recommended Action Steps:

  1. Check Coolant Level & Condition: With the engine cool, check the coolant level in the reservoir. Also, observe its color. Healthy DEX-COOL (the type your Buick uses) is typically orange/red. If it's brown, murky, or has particles, it's definitely time for a flush.
  2. Coolant Type: Your 2017 Buick LaCrosse requires DEX-COOL Extended Life Organic Acid Technology (OAT) coolant. It's crucial to use this specific type and not mix it with conventional green coolants, as this can lead to gelling and severe cooling system issues. Always use a 50/50 mix of DEX-COOL and distilled water.
  3. Flush Interval: Buick generally recommends a coolant flush for DEX-COOL systems every 5 years or 100,000-150,000 miles, whichever comes first. At 80,000 miles and being a 2017 model, you're within the timeframe where a flush is highly beneficial.
  4. Bleeding Air: After refilling, it's critical to properly bleed any air from the cooling system to prevent air pockets that can cause localized overheating.

When to See a Shop:

  • If the temperature gauge continues to rise after a flush, or if the engine fully overheats.
  • If you notice any coolant leaks (puddles under the car, sweet smell).
  • If you're uncomfortable performing the flush yourself, as it involves handling hot fluids and ensuring proper air bleeding.
  • If you encounter an OBD-II code like P0128 (Coolant Thermostat (Coolant Temperature Below Regulating Temperature)), which could indicate a failing thermostat, or other codes related to cooling system sensors.
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