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<h2><span style="font-size: 18px;">What is a car's heater core?</span></h2>
<p>&nbsp;</p>
<p>A car's heater core is like a small radiator that is located in the dashboard of the car. It is responsible for producing heat to warm up the interior of the car when you turn on the heating system. When you turn on the heating system, hot coolant from the car's engine flows through the heater core and heats up the metal tubes and fins inside the core. The blower motor then blows air over the heated tubes and fins, which warms up the air and sends it into the cabin of the car.</p>
<p>&nbsp;</p>
<h2><span style="font-size: 18px;">Heater core failing symptoms</span></h2>
<p>&nbsp;</p>
<p>Identifying the symptoms of a heater core leak can be challenging. Some of these symptoms may not appear to be related to a heater core problem, which emphasizes the need to identify and address them promptly. The signs include:</p>
<ul>
<li>Interior windows fogging up;</li>
<li>Fruity odor both inside and outside the car;</li>
<li>Higher than normal coolant consumption;</li>
<li>Cold air blowing out of the heater vents.</li>
</ul>
<p>&nbsp;</p>
<h2><span style="font-size: 18px;">How to fix a broken heater core?&nbsp;</span></h2>
<p><br />Fixing a heater core can be a difficult and involved process, and it may not always be possible to repair a heater core. However, some potential solutions include:</p>
<ol>
<li><strong>Flush the heater core</strong>: Over time, debris and sediment can accumulate in the heater core, leading to blockages and reduced heating performance. Flushing the heater core with a specialized cleaning solution can help to remove these blockages and improve heating performance.</li>
<li><strong>Patch the heater core</strong>: In some cases, it may be possible to patch a leaking heater core with a sealant or other repair material. This is typically only a temporary fix, and a replacement heater core may still be needed in the long run.</li>
<li><strong>Replace the heater core</strong>: If the heater core is damaged beyond repair, or if other solutions have been unsuccessful, the heater core will need to be replaced. This typically involves a complex and involved process, as outlined in previous answers.</li>
</ol>
<p>It's important to consult with a qualified mechanic to determine the best course of action for repairing or replacing. Additionally, attempting to fix a heater core yourself can be dangerous and may result in further damage to the vehicle or personal injury.</p>
<p>&nbsp;</p>
<h2><span style="font-size: 18px;">Heater core replacement</span></h2>
<p>&nbsp;</p>
<p>Replacing a heater core is a complex and involved process that requires a significant amount of professional skills and time. The process can vary depending on the make and model of the vehicle, but generally involves the following steps:</p>
<ul>
<li>Drain the coolant;</li>
<li>Remove the dashboard;</li>
<li>Remove the old heater core;</li>
<li>Install the new heater core;</li>
<li>Reassemble the dashboard;</li>
<li>Refill the coolant.</li>
</ul>

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Lexus ES300 Heater Core