Coolant Leak and No Heat in my 2016 Chrysler 300

ClearTheCode admin answer:

Your symptoms – a sweet smell, low coolant, puddles, and no heat – strongly suggest a coolant leak and potentially air in your cooling system. While a head gasket is a possibility, there are several more common culprits for these issues in a 2016 Chrysler 300.

Here's a breakdown of what might be happening:

1. Common Leak Points:

   • Water Pump: A very common failure point. Look for coolant dripping from the front of the engine, usually near the drive belt.
   • Radiator: Cracks in the plastic end tanks or corrosion in the core can lead to leaks. Check for green or orange stains on the radiator fins.
   • Hoses: Radiator hoses, heater hoses, and other smaller coolant lines can develop cracks or loose connections over time. Inspect all visible hoses for bulges, cracks, or wet spots.
   • Heater Core: If the leak is inside the cabin (damp carpet on the passenger side, fogging windows, strong sweet smell), your heater core might be leaking. This would also explain the lack of heat, as a leaking core won't allow proper coolant circulation.
   • Thermostat Housing: The housing where the thermostat is located can sometimes crack or have a failing gasket.

2. No Heat Explanation:

   • When coolant levels are low, air can enter the cooling system. Air pockets prevent hot coolant from circulating through the heater core, resulting in no heat in the cabin.

3. When to See a Shop:

   • Immediately: A coolant leak is not something to ignore. Low coolant can quickly lead to engine overheating, which can cause severe and extremely expensive damage (e.g., warped cylinder heads, blown head gasket).
   • Professional Diagnosis: A mechanic can perform a cooling system pressure test to quickly locate the source of the leak. They can also properly bleed the cooling system to remove any air pockets once the leak is repaired. Do not attempt to drive long distances with low coolant or no heat.