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Coolant smell & low reservoir in my 2020 Challenger GT - Leak somewhere?

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Mike T. · rep 0 · May 25, 4:15 AM · 1 replies · solved · Question

Vehicle: 2020 Dodge Challenger GT

Hey everyone,

I've got a 2020 Dodge Challenger GT (V6, 3.6L Pentastar) with about 40,000 miles. Lately, I've noticed a distinct smell of coolant, especially after driving, and I've had to top off the coolant reservoir a couple of times in the last month. There aren't any huge puddles, just maybe a small drip here and there, but it's consistent.

The temperature gauge seems normal, but I'm worried about a slow leak. I've checked the obvious hoses, but can't pinpoint it. Has anyone with a Pentastar engine in their Challenger or other Dodge model experienced this? What are the common leak points to check?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:15 AM

0

ClearTheCode admin answer:

A persistent coolant smell and a dropping reservoir level in your 2020 Dodge Challenger GT (with the 3.6L Pentastar engine) indicate a leak in the cooling system. Even small leaks can eventually lead to overheating if not addressed. Here are common leak points for the Pentastar engine and steps to take:

  1. Water Pump: The water pump is a common failure point on many vehicles, including the Pentastar. Look for coolant stains or drips directly below the water pump, which is typically located on the front of the engine.
  2. Thermostat Housing/Coolant Crossover: The plastic thermostat housing and the integrated coolant crossover pipe on the Pentastar engine are known to develop cracks or leaks at the seams, especially as they age. Inspect these areas carefully for pink or orange coolant residue.
  3. Radiator Hoses: Check all radiator hoses (upper and lower) and heater core hoses for cracks, bulges, or loose clamps. Squeeze them when the engine is cold to check for softness or brittleness.
  4. Radiator: Inspect the radiator fins for any signs of corrosion, damage, or coolant seepage. Sometimes leaks are very small and only visible when the system is under pressure.
  5. Oil Cooler Assembly (Pentastar Specific): The oil filter housing assembly, which often includes an integrated oil cooler, is located in the engine's valley and is a very common leak point for the Pentastar. Coolant can leak from here and drip down the back of the engine, making it hard to spot.
  6. Heater Core: If you notice a sweet smell inside the cabin, or a film on the inside of your windshield, it could indicate a leaking heater core.

Diagnostics:

  • Pressure Test: The most effective way to find a slow leak is to have a cooling system pressure test performed. A shop will pressurize the system when the engine is cold, making leaks more visible.
  • UV Dye: Adding UV dye to the coolant can help pinpoint elusive leaks. Drive the car for a day or two, then inspect with a UV light.

When to see a shop:

  • Immediately if your temperature gauge starts to climb above normal, or if you notice steam coming from under the hood. Overheating can cause severe engine damage.
  • If you cannot locate the source of the leak yourself, especially if it appears to be coming from less accessible areas like the oil cooler assembly or thermostat housing.
  • A professional can quickly diagnose the leak using specialized tools and perform the necessary repairs, which can be complex depending on the leak location.
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