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Coolant Leak and Overheating on my 2017 IS 350 F Sport

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Sarah K. · rep 0 · May 22, 4:42 AM · 1 replies · solved · Question

Vehicle: 2017 Lexus IS 350 F Sport

Hey everyone,

I've got a problem with my 2017 Lexus IS 350 F Sport. Recently, I've noticed a sweet smell coming from the engine bay, and my coolant reservoir seems to be dropping faster than it should. I also spotted a small puddle under the front of the car after it's been parked for a while, which looks like coolant.

To make matters worse, the temperature gauge has started creeping up higher than normal, especially in traffic, and I've even seen the 'High Engine Temp' warning light flash a couple of times. I'm really worried about potential engine damage.

Has anyone experienced a coolant leak or overheating issues with their 2016-2026 IS 350? What was the cause, and how difficult was the repair? I'm trying to figure out if this is a common problem or just bad luck.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:42 AM

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Hi Emily,

Coolant leaks and overheating on a 2017 Lexus IS 350 are serious issues that need prompt attention to prevent engine damage. Here are the most common culprits and what to do:

Common Causes:

  1. Water Pump Failure: This is a very common point of failure on many vehicles, including some Lexus models. The water pump circulates coolant, and its seals or bearings can wear out, leading to leaks and reduced efficiency. You might hear a whining noise if the bearings are failing.
  2. Radiator Leaks: The radiator can develop cracks or pinholes over time due to corrosion, road debris, or age, leading to coolant loss.
  3. Hoses and Clamps: Coolant hoses (upper, lower, heater hoses) can degrade, crack, or become loose at their connections, causing leaks. Hose clamps can also loosen or fail.
  4. Thermostat Housing Gasket: The gasket around the thermostat housing can fail, leading to a leak. Sometimes the housing itself can crack.
  5. Heater Core: While less common for external puddles, a leaking heater core can cause a sweet smell inside the cabin and coolant loss.

When to See a Shop:

  1. Immediate Action: If your 'High Engine Temp' warning light comes on, pull over safely as soon as possible and shut off the engine. Continuing to drive an overheating engine can cause catastrophic damage (e.g., warped cylinder heads, blown head gasket).
  2. Professional Inspection: A coolant system pressure test is the most effective way to pinpoint the exact source of a leak. A mechanic can pressurize the system and visually inspect for drips or use a dye to find elusive leaks.
  3. Don't Delay: Any persistent coolant loss or signs of overheating warrant immediate professional diagnosis and repair. Ignoring these symptoms will almost certainly lead to much more expensive engine repairs.
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