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2018 Dodge Charger R/T - Overheating and Low Coolant Warning

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Amanda S. · rep 0 · May 22, 5:47 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

Hey everyone,

I've got a 2018 Dodge Charger R/T with about 75,000 miles on it, and I've been running into some issues lately. Over the past week, I've noticed the temperature gauge creeping up higher than usual, especially in stop-and-go traffic. Yesterday, I got a 'Low Coolant' warning on the dash, and the engine temperature spiked pretty quickly.

I checked the coolant reservoir, and it was indeed pretty low. I topped it off with the correct OAT coolant, but I'm worried there might be a bigger underlying problem. I haven't seen any obvious puddles under the car, but I'm not sure where else to look. The heater seems to be working fine, so I don't think it's a heater core issue.

Has anyone else experienced this with their Charger? What should I be checking next? I'm trying to avoid a costly shop visit if it's something I can tackle myself. Any advice on common culprits for overheating and low coolant in these models would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:47 AM

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ClearTheCode admin answer:

Experiencing overheating and low coolant in your 2018 Dodge Charger R/T at 75,000 miles is a common concern that requires prompt attention to prevent more serious engine damage. Here's a breakdown of steps and potential causes:

  1. Inspect for Leaks Thoroughly: Even without puddles, small leaks can evaporate quickly. Check all coolant hoses (upper, lower radiator hoses, heater hoses) for cracks, bulges, or wetness. Pay close attention to the radiator itself, the water pump weep hole (often on the bottom of the pump housing), and around the thermostat housing. A pressure test kit can help identify elusive leaks.

  2. Check Radiator Fan Operation: With the engine running and at operating temperature (or with the A/C on), ensure both radiator cooling fans are engaging. If they're not spinning or only one is, it could be a faulty fan motor, relay, or fuse. This is a common cause of overheating in traffic.

  3. Thermostat Functionality: A stuck or failing thermostat is a frequent culprit for overheating. If the thermostat isn't opening fully, coolant won't circulate properly. A common OBD-II code associated with this is P0128 (Coolant Thermostat (Coolant Temperature Below Regulating Temperature)), though it can also cause overheating if stuck closed. Replacing the thermostat is a relatively straightforward DIY for many.

  4. Coolant System Flush and Refill: If you haven't had a coolant flush in a while, it might be time. Over time, coolant can degrade and lose its heat transfer properties. Ensure you use the correct OAT (Organic Acid Technology) coolant, typically Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula (Purple or Pink). Mixing coolant types can cause gelling and damage.

  5. Water Pump Condition: While less common at 75k miles without obvious leaks, a failing water pump can lead to poor coolant circulation. Listen for any grinding noises from the front of the engine.

When to See a Shop:

  • If you continue to experience overheating after checking these items.
  • If you notice white smoke from the exhaust (potential head gasket issue).
  • If you find significant leaks that you're uncomfortable repairing.
  • If the check engine light illuminates with codes indicating engine performance issues beyond P0128.

Addressing this promptly will help maintain your Charger's reliability.

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