Chrysler 200 No Heat Diagnosis: Thermostat Replacement & Cooling System Flush

Diagnosing No Heat Complaint

• 💡 A 2012 Chrysler 200 presented with a complaint of little to no heat coming from the dash.
• 🔍 A coolant leak was observed near the plastic water outlet housing, indicating a potential issue with the thermostat assembly.
• 🌡️ The customer requested replacement of both thermostats, the leaking water outlet, and a full cooling system flush.

Thermostat and Water Outlet Replacement

• 🛠️ The vehicle features a twin thermostat housing, requiring the removal of several components for access.
• 💧 A coolant leak was confirmed around the plastic housing, which is a common failure point.
• ⚙️ The process involved draining the coolant, removing the old housing, and preparing for the installation of new parts.

Cooling System Flush and Cleaning

• 🌊 The drained coolant was found to be dirty, with gritty sediment that could potentially clog the heater core.
• 💨 A cooling system flush was performed using compressed air to agitate and remove debris from the block, radiator, and heater core.
• 🧼 The overflow tank was also removed and cleaned thoroughly using hot water, dish soap, and a piece of chain to break up sediment.

Reassembly and Testing

• 💧 A new O-ring was installed on the pipe leading to the water pump, and the thermostat housing was reassembled with new gaskets.
• 🔌 The coolant temperature sensor, noted for its brittle nature, was replaced after its original retainer broke during removal.
• 🔥 After reassembly and filling with Mopar 5-year coolant, the vehicle was tested. Vent temperatures reached approximately 190°F, indicating a successful repair and restored heat.

Key Takeaways

• 🌱 Addressing cooling system issues promptly can prevent more severe problems, such as a completely clogged heater core.
• ✅ The repair highlights the importance of a thorough cooling system service, including flushing and component replacement, to resolve heating issues.