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2020 Telluride Running Hot & Low Coolant - Coolant Flush or Thermostat?

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Dan C. · rep 0 · May 22, 3:11 AM · 1 replies · solved · Question

Vehicle: 2020 Kia Telluride SX

Hi everyone,

I own a 2020 Kia Telluride SX with about 55,000 miles. Lately, I've noticed the engine temperature gauge creeping up a bit higher than usual, especially in stop-and-go traffic or when climbing hills. It hasn't redlined, but it's definitely warmer. I also checked the coolant reservoir, and the level is a bit low, though I don't see any obvious leaks on the ground.

I'm wondering if it's time for a coolant flush, or if this could be a sign of a failing thermostat. What's the recommended coolant service interval for the Telluride? Is this something I can tackle myself, or is it better left to a professional? Any specific type of coolant I should use?

Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:11 AM

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ClearTheCode admin answer:

Experiencing higher-than-normal engine temperatures and low coolant in your 2020 Kia Telluride SX at 55,000 miles warrants immediate attention. While a coolant flush is good preventative maintenance, these symptoms could indicate a more specific issue like a failing thermostat or a minor leak.

Here's a breakdown of potential causes and actions:

  1. Causes of Overheating/Low Coolant:

    • Low Coolant Level: The most direct cause. Even without visible leaks, small amounts can evaporate or seep out over time. A very slow leak might not leave puddles.
    • Failing Thermostat: A thermostat stuck closed or partially closed will restrict coolant flow, causing the engine to overheat.
    • Clogged Radiator/Cooling System: Sediment or corrosion can build up, reducing the cooling efficiency.
    • Water Pump Issues: A failing water pump can reduce coolant circulation.
    • Radiator Fan Problems: Fans not engaging or running at full speed can cause overheating, especially at low speeds or idle.

  2. Coolant Service Interval:

    • Kia typically recommends checking coolant levels at every oil change. For a full coolant flush/replacement, the interval can vary, but for many modern vehicles, it's often around 60,000 miles or 5 years, whichever comes first. Your Telluride is approaching this interval.

  3. DIY Diagnosis & Maintenance:

    • Check Coolant Level & Top Off: First, ensure the engine is cool. Carefully open the radiator cap (if present) and check the level. Top off the reservoir to the 'Full' line with the correct type of coolant. For Kia, this is typically an ethylene glycol-based, long-life coolant (often green or blue, but always check your owner's manual for the exact specification, e.g., SP-IV or similar).
    • Inspect for Leaks: Look for dried coolant residue around hoses, the radiator, water pump, and engine block. A pressure test kit can help identify small leaks.
    • Observe Thermostat Behavior: After topping off, start the engine and let it warm up. Feel the upper and lower radiator hoses. Both should eventually get warm. If the upper hose is hot but the lower hose remains cold, it's a strong indicator of a stuck thermostat.
    • Radiator Fan Check: Listen for the radiator fans to engage when the engine gets warm or when the AC is on.

  4. DIY Coolant Flush (If no other issues found):

    • This is a moderately difficult DIY task. You'll need to drain the old coolant, flush the system with distilled water, and then refill with the correct coolant/water mixture. Proper air bleeding is crucial.

  5. When to See a Shop:

    • If topping off the coolant doesn't resolve the issue, and you continue to see high temperatures.
    • If you suspect a failing thermostat, water pump, or radiator fan.
    • If you find significant leaks.
    • If you're uncomfortable performing a coolant flush or diagnosing cooling system components. A shop can perform a pressure test, chemical test for head gasket leaks, and properly diagnose the root cause.
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