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2017 CT6 Engine Running Hot - Coolant Flush Needed?

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David L. · rep 0 · May 22, 4:00 AM · 1 replies · solved · Question

Vehicle: 2017 Cadillac CT6 Platinum

Hello Cadillac owners,

I own a 2017 Cadillac CT6 Platinum with the 3.0L Twin Turbo engine, and it has about 60,000 miles on it. Recently, I've noticed the engine temperature gauge creeping up a bit higher than usual, especially when I'm stuck in traffic or driving uphill. It hasn't redlined, but it's definitely warmer than I'm comfortable with.

I checked the coolant reservoir, and the level seems okay, but I'm not sure when the coolant was last changed. Could this be a sign that I need a coolant flush? What's the recommended interval for a coolant flush on these CT6s, especially with the twin-turbo engine? Any other common causes for this issue I should look into? Thanks for the help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:00 AM

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ClearTheCode admin answer:

An engine running hotter than usual in your 2017 Cadillac CT6 Platinum with the 3.0L Twin Turbo engine at 60,000 miles warrants immediate attention. A coolant flush is a good starting point, but other factors could be at play.

  1. Common Causes of Overheating/High Temps:
    • Degraded Coolant: Over time, coolant loses its anti-corrosion properties and heat transfer efficiency. Old coolant can also lead to sediment buildup.
    • Low Coolant Level: Even if the reservoir looks okay, the radiator or other parts of the system might be low.
    • Thermostat Issues: A stuck or failing thermostat can prevent coolant from circulating properly.
    • Radiator/Condenser Blockage: External debris (leaves, bugs) can block airflow, or internal corrosion can restrict flow.
    • Water Pump Failure: A failing water pump won't circulate coolant effectively.
    • Cooling Fan Issues: Malfunctioning cooling fans (especially in traffic) can cause temperatures to rise.
  2. Coolant Flush Interval: For your 2017 CT6, Cadillac generally recommends a coolant flush and fill every 5 years or 150,000 miles, whichever comes first, using Dex-Cool extended-life coolant. At 60,000 miles, you're well within the mileage, but if it's been 5 years since the last change, or if the coolant appears discolored or sludgy, a flush is advisable.
  3. Coolant Type: Always use Dex-Cool (Orange) extended-life coolant. Mixing different types of coolant can lead to chemical reactions that form sludge and damage the cooling system.
  4. DIY vs. Professional: While a basic drain and fill can be done by a DIYer, a proper flush involves specialized equipment to ensure all old coolant is removed and the system is free of air pockets. Given the complexity of modern cooling systems, especially with a twin-turbo engine, a professional service is recommended to ensure thoroughness and proper bleeding.

When to See a Shop: If the temperature gauge continues to rise, if you notice any coolant leaks, hear unusual noises (like a failing water pump), or if the 'Check Engine' light illuminates (possibly with codes like P0128 - Coolant Thermostat Rationality), take your CT6 to a certified Cadillac service center immediately. Driving with an overheating engine can cause severe and irreversible damage.

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