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Overheating 2017 Ford Explorer XLT - Coolant Leak Suspected

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David L. · rep 0 · May 22, 2:24 AM · 1 replies · solved · Question

Vehicle: 2017 Ford Explorer XLT

Hello forum,

My 2017 Ford Explorer XLT, with the 3.5L V6 engine, has been giving me trouble lately. It's started running hot, with the temperature gauge frequently climbing higher than normal. I've also noticed a distinct sweet smell around the car and, more concerningly, small puddles of coolant under the front of the vehicle when it's parked.

I'm having to top off the coolant reservoir almost weekly now. The car has about 90,000 miles on it. Could this be a failing water pump, or perhaps something else like a thermostat housing issue? Any advice on where to start looking would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:24 AM

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ClearTheCode admin answer:

Overheating and visible coolant leaks in a 2017 Ford Explorer with the 3.5L V6 are serious issues that need immediate attention to prevent engine damage. The sweet smell and puddles are clear indicators of a coolant system breach. While a Check Engine Light (CEL) might not be on yet, a P0128 code (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)) could eventually appear if the thermostat is stuck open or the engine struggles to reach operating temperature due to leaks.

Here are the most common culprits for your symptoms:

  1. Water Pump Failure:

    • Cause: The water pump is a common failure point on many vehicles, including the 3.5L V6 in the Explorer. Leaks often occur from the weep hole or around the pump's gasket as it wears out.
    • Action: Inspect the area around the water pump (usually located on the front of the engine) for signs of coolant residue or active dripping. This is a significant repair, often requiring removal of the timing cover.

  2. Thermostat Housing/Gasket Leak:

    • Cause: The plastic thermostat housing or its gasket can crack or degrade over time, leading to coolant leaks.
    • Action: Visually inspect the thermostat housing and surrounding hoses for any signs of leakage.

  3. Radiator or Hoses:

    • Cause: The radiator can develop cracks, or hoses can become brittle and leak, especially at connection points.
    • Action: Check the radiator fins for damage or wet spots, and inspect all upper and lower radiator hoses, as well as heater hoses, for cracks, bulges, or loose clamps.

  4. Coolant Reservoir/Cap:

    • Cause: A cracked reservoir or a faulty pressure cap can also lead to coolant loss and overheating.
    • Action: Inspect the reservoir for cracks and ensure the cap seals properly.

When to see a shop: Given the consistent coolant loss and overheating, it's crucial to have your Explorer professionally inspected as soon as possible. Continuing to drive an overheating vehicle can lead to catastrophic engine damage (e.g., head gasket failure). A mechanic can perform a pressure test on the cooling system to quickly pinpoint the exact source of the leak and recommend the necessary repairs.

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