Mitsubishi Eclipse Heater Isn't Working

Common Causes of Heater Issues in Your Mitsubishi Eclipse and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
31% chance it's the
Heater Blower Motor
0%
18% chance it's the
Heater Blower Motor Resistor
0%
51% chance it's
Something else
The most common reasons a Mitsubishi Eclipse heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
  • Heater Blower Motor: A faulty heater blower motor can result in inadequate airflow or no air circulation in the cabin, affecting the heating system's performance.
  • Heater Blower Motor Resistor: A faulty heater blower motor resistor can cause inconsistent fan speeds or complete failure of the blower motor.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

Troubleshooting Heater Issues in a Mitsubishi Eclipse

When troubleshooting heater issues in your Mitsubishi Eclipse, it's essential to adopt a systematic diagnostic approach. Start by checking the coolant levels in the radiator, as low coolant can significantly impact heating performance. If the coolant is adequate, the next step is to inspect the thermostat; a malfunctioning thermostat can prevent the engine from reaching the optimal temperature for heating. Following this, examine the heater core for any signs of clogs or leaks, as these can directly affect heat output. Additionally, ensure that the heater control valve is functioning properly, as it regulates the flow of hot coolant into the heater core. Don't overlook the blower motor; if it's not operating correctly, it can hinder heat circulation within the cabin. Lastly, verify that the temperature blend door is working as intended, as it controls the mix of hot and cold air entering the cabin. By following this structured approach, you can effectively diagnose and potentially resolve heater issues in your Mitsubishi Eclipse, ensuring a comfortable driving experience. If these steps do not resolve the issue, seeking assistance from a professional mechanic may be necessary.

What to Check When the Heater Isn't Working in a Mitsubishi Eclipse?

When your Mitsubishi Eclipse's heater fails to operate, several common problems may be at play. Start by checking the coolant levels, as insufficient coolant can significantly impair heater performance. If the coolant is adequate, consider the possibility of air pockets within the cooling system, which can obstruct proper circulation; bleeding the system may be necessary to eliminate these air pockets. Another critical component to inspect is the heater core, as a malfunction here can lead to inadequate heating and may require repair or replacement. Additionally, an airlocked cooling system can prevent coolant from flowing effectively, so addressing this issue is vital for restoring heater functionality. Lastly, a malfunctioning thermostat can disrupt the entire heating system, making it essential to verify its operation and replace it if needed. By systematically addressing these common issues, you can effectively troubleshoot and repair your Mitsubishi Eclipse's heating system, ensuring a comfortable driving experience. Regular maintenance checks can further enhance the heater's reliability and performance.

Why is the Heater Not Working in a Mitsubishi Eclipse?

When your Mitsubishi Eclipse's heater fails to operate, it’s crucial to act promptly, as neglecting the issue can lead to more significant problems down the line. Common culprits include a malfunctioning blower motor or thermostat, which can disrupt the heating system's functionality. If you notice that heat only comes through when driving, it may indicate low coolant levels, air pockets in the system, or even a failing heater core. Additionally, issues with the actuators that control airflow can further complicate the situation. To effectively troubleshoot, check if both heater hoses are hot when the engine reaches full operating temperature; if they are cold, this could signal a circulation problem that requires immediate attention. Addressing these symptoms not only ensures your comfort but also prevents potential safety risks and costly repairs in the future.

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