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Coolant Smell & Low Level on 2021 Ram 1500 - Where's the Leak?

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David L. · rep 0 · May 22, 3:36 AM · 1 replies · solved · Question

Vehicle: 2021 Ram 1500 Laramie 5.7L Hemi

I've got a 2021 Ram 1500 Laramie with the 5.7L Hemi and about 40,000 miles. For the past few weeks, I've been smelling coolant, especially after driving, and I noticed the coolant reservoir is consistently low. I've topped it off a couple of times, but it keeps dropping. I don't see any obvious puddles under the truck, and there's no visible smoke from the exhaust.

Where are the common leak points on these newer Ram 1500s? I've checked the radiator hoses, but they seem fine. Could it be something less obvious? I'm trying to avoid a major issue.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:36 AM

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A persistent coolant smell and dropping reservoir level without visible puddles can be frustrating, but it's crucial to address quickly to prevent overheating. On your 2021 Ram 1500 Hemi, several common areas are prone to leaks, even at 40,000 miles.

Here's a systematic approach to finding the leak:

  1. Water Pump: This is a very common failure point. Check the weep hole on the underside of the water pump for signs of dried coolant residue or active dripping. The leak might be slow and evaporate before hitting the ground.
  2. Radiator End Tanks: Inspect the plastic end tanks of the radiator where they meet the aluminum core. Small cracks can develop, leading to slow, hard-to-spot leaks.
  3. Heater Core Hoses/Connections: Follow the heater hoses from the engine to the firewall. Look for dampness or residue around the clamps and connections. A leak here might drip onto the exhaust, causing the smell to be more prominent.
  4. Thermostat Housing: The housing where the thermostat is located can sometimes develop leaks, especially around the gasket.
  5. Intake Manifold Gasket: On Hemi engines, an internal coolant leak through the intake manifold gasket can occur, leading to coolant consumption without external signs. This can sometimes be identified by white smoke from the exhaust (though you mentioned you don't see it) or by checking the oil for a milky appearance (which indicates coolant mixing with oil).
  6. Pressure Test: The most effective way to find a slow leak is to perform a cooling system pressure test. This involves pressurizing the system when the engine is cold and off, making leaks more apparent.

When to See a Shop: If you can't locate the leak yourself, or if you suspect an internal leak (like an intake manifold gasket or head gasket), it's imperative to take your truck to a professional mechanic. They have specialized tools like pressure testers and UV dye kits to pinpoint elusive leaks. Ignoring a coolant leak can lead to engine overheating, which can cause severe and expensive engine damage.

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