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2018 Equinox Overheating - Time for Coolant Flush?

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Sarah K. · rep 0 · May 24, 1:18 PM · 1 replies · solved · Question

Vehicle: 2018 Chevrolet Equinox LT

Hey everyone, I've got a 2018 Chevrolet Equinox LT with about 75,000 miles on it. Lately, I've noticed the temperature gauge creeping up a bit higher than usual, especially in stop-and-go traffic. It hasn't fully overheated yet, but it's making me nervous. I checked the coolant reservoir, and the level seems okay, but the fluid looks a bit discolored, maybe brownish.

I'm wondering if it's time for a coolant flush. I haven't had one done since I bought the car used at 40k miles. Is this something I can tackle myself, or should I take it to a shop? What kind of coolant does a 2018 Equinox typically use? Any tips or things to watch out for if I try to do it at home?

Also, are there any other things I should check if my Equinox is running a bit hot? I'm trying to avoid any major engine issues down the road. Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:18 PM

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ClearTheCode admin answer: It sounds like you're on the right track, Sarah. Discolored coolant and rising temperatures at 75,000 miles on your 2018 Chevrolet Equinox LT definitely suggest it's time to address your cooling system.

  1. Confirm the Issue: Before diving into a flush, ensure your coolant level is correct when cold. Also, check for any visible leaks around hoses, the radiator, or the water pump. A quick check of your radiator fan operation when the engine is warm can also rule out a simple fan issue. If your 'Check Engine' light is on, retrieve any stored OBD-II codes, especially those related to engine temperature (e.g., P0117, P0118 for ECT sensor, or P0128 for thermostat).

  2. Coolant Flush Importance: Coolant degrades over time, losing its corrosion inhibitors and heat transfer capabilities. A flush removes old coolant and any accumulated sediment, replacing it with fresh fluid to protect your engine. For your 2018 Equinox, Chevrolet typically recommends a coolant flush every 5 years or 150,000 miles, whichever comes first, using Dex-Cool (Orange) extended-life coolant. Given your mileage and symptoms, a flush is a good preventative measure.

  3. DIY Considerations:

    • Safety First: Always work on a cool engine. Wear gloves and eye protection. Coolant is toxic.
    • Draining: Locate the radiator drain plug (petcock) at the bottom of the radiator and open it to drain the old coolant into a suitable container.
    • Flushing: You can use distilled water to flush the system until the water runs clear. Some prefer a dedicated cooling system flush product, following its instructions.
    • Refilling: Close the drain plug. Refill the system slowly with the correct 50/50 Dex-Cool mixture.
    • Bleeding Air: This is crucial. Run the engine with the heater on high and the radiator cap off (or reservoir cap if applicable) to allow air bubbles to escape. Squeeze the radiator hoses gently. Top off coolant as needed.

  4. When to See a Shop:

    • If you're uncomfortable with the DIY process or lack the proper tools.
    • If, after a flush, the overheating persists. This could indicate a failing thermostat, water pump, clogged radiator, or head gasket issue.
    • If you find significant leaks or notice strange noises from the engine bay.
    • If you retrieve persistent OBD-II codes related to the cooling system that don't clear after basic maintenance.

A professional can perform a pressure test on your system and use specialized equipment to ensure all air is bled out, which is sometimes tricky for DIYers.

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