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Coolant Leak on 2016 Ram 1500 3.6L Pentastar - Where to Look?

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Mike T. · rep 0 · May 25, 2:32 AM · 1 replies · solved · Question

Vehicle: 2016 Ram 1500 Rebel

I've been noticing a sweet smell around my 2016 Ram 1500 Rebel with the 3.6L Pentastar engine, and my coolant reservoir level has been slowly dropping. I can't see any obvious puddles on the ground, but I'm worried it's a leak somewhere. The engine temperature gauge seems normal, but I don't want to risk overheating.

Where are the common places for these Pentastar engines to leak coolant? Are there any specific hoses or components I should check first? I'd like to try and find it myself before taking it in for a potentially expensive repair.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:32 AM

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ClearTheCode admin answer:

Coolant leaks on the 3.6L Pentastar engine in Ram 1500s are quite common, and the sweet smell is a classic indicator. Since you're not seeing puddles, it could be a slow leak that evaporates or drips onto hot engine components. Here are the most frequent culprits:

Common Leak Points to Inspect:

  1. Thermostat Housing: This is arguably the most common leak point. The housing is typically plastic and can crack or warp over time, or the O-ring seal can fail. It's located on the front of the engine, usually near the serpentine belt.
  2. Oil Filter Housing Assembly (with integrated oil cooler): This complex assembly sits between the cylinder heads and includes an oil cooler that uses engine coolant. Gaskets within this assembly can fail, leading to both oil and coolant leaks. Look for coolant pooling in the valley of the engine block, under the intake manifold.
  3. Water Pump: The water pump can develop leaks from its shaft seal or gasket. Look for coolant residue or drips directly below the pump, usually on the passenger side of the engine.
  4. Radiator: Check the top and bottom tanks of the radiator, especially where the plastic tanks meet the aluminum core. Small cracks can form. Also, inspect the radiator hoses and their connection points for swelling or drips.
  5. Heater Core Hoses: Follow the hoses that go from the engine to the firewall (for the heater core). Connections can loosen, or hoses can develop small cracks.

DIY Inspection Steps:

  • Visual Inspection: With the engine cold, carefully inspect all the areas mentioned above using a bright flashlight. Look for pink, orange, or green crusty residue (depending on your coolant type) or wet spots.
  • Pressure Test (Recommended): The most effective DIY method is to rent or buy a cooling system pressure tester from an auto parts store. Connect it to the radiator cap opening and pump it up to the specified pressure (check your owner's manual or service manual). This will pressurize the system and often reveal even small leaks as drips or sprays.
  • Cardboard Test: Place a large piece of clean cardboard under the front of your truck overnight to catch any drips.

When to See a Shop: If you can't locate the leak, or if the leak appears to be from the oil filter housing assembly (which is a more involved repair requiring intake manifold removal), it's best to take your Ram to a professional. They have specialized tools and experience to diagnose and repair these more complex leaks, ensuring proper sealing and preventing potential engine damage from overheating.

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