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The AC evaporator is housed within the HVAC unit and is responsible for cooling the air that flows into the vehicle's cabin.&nbsp;The evaporator core contains a series of coils and tubes through which a cold, low-pressure refrigerant circulates. As warm air from inside the car passes over the evaporator coils, heat is absorbed by the refrigerant, causing it to evaporate and become a gas.
&nbsp;
This heat exchange process cools the air passing over the coils, resulting in the air exiting the AC system being significantly colder than the air that entered it.&nbsp;In addition to cooling, the AC evaporator also removes humidity from the air. As the air cools, moisture condenses on the evaporator coils, effectively reducing the humidity level inside the vehicle. This dehumidifying action enhances passenger comfort, particularly in humid conditions.
&nbsp;
<h2>Warning signs of a bad A/C evaporator</h2>
&nbsp;
<ul>
<li>Weak cooling: Reduced cooling efficiency with less cold air.</li>
<li>Airflow problems: Limited or blocked airflow from AC vents.</li>
<li>Unpleasant odors: Foul or musty smells while the AC is running.</li>
<li>Refrigerant leak: Frequent need for refrigerant recharging.</li>
<li>Poor dehumidification: Ineffective humidity control, especially in humid conditions.</li>
<li>Interior moisture: Water or puddles inside the car.</li>
<li>Unusual noises: Hissing or bubbling sounds.</li>
<li>Icing on evaporator: Excessive ice or frost buildup.</li>
<li>Decreased fuel Efficiency: Added strain on the AC system and engine.</li>
<li>Visible leaks: Coolant or moisture around the evaporator.</li>
</ul>
&nbsp;
<h2>How to fix a car AC evaporator leak</h2>
&nbsp;
<ol>
<li>Diagnosis: Identify the leak's location and extent.</li>
<li>Refrigerant recovery: Safely remove refrigerant to comply with regulations.</li>
<li>Dashboard disassembly: Disassemble the dashboard and interior components to access the evaporator.</li>
<li>Evaporator replacement: Remove and replace the damaged evaporator with a new one.</li>
<li>Seal replacement: Replace o-rings, gaskets, and seals in the ac system.</li>
<li>Reassembly: Reassemble the interior components and ensure secure connections.</li>
<li>Vacuum and refrigerant recharge: Evacuate the system, remove air and moisture, and recharge with the correct refrigerant.</li>
<li>Leak testing: Use specialized equipment to check for leaks.</li>
<li>Performance testing: Verify proper cooling, dehumidification, and system functionality.</li>
</ol>

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

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Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Electric Vacuum Pump

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Engine Air Filter

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Intake Manifold

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Oxygen Sensor

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Pressure Sensor

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Engine Oil Dipstick Tube

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Fuel Cooler

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Catalytic Converter

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EGR Valve

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Exhaust Manifold

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Fuel Vapor Leak Detection Pump

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Secondary Air Injection Check Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

1999 Mercury Mountaineer AC Evaporator

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