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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>

AC Evaporator

Air Cleaner

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Air Intake Resonator

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

Intake Manifold Repair Bracket

Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

Engine Valve Covers & Ignition Coils Kits

Glow Plug

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Glow Plug Relay Module

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Ignition Coil

Ignition Coils & Spark Plugs & Wires Kits

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Ignition Coils & Spark Plugs Kits

Ignition Coils & Wires Kits

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Ignition Distributor

Ignition Lock Cylinder

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Ignition Starter Switch

Ignition Switch Actuator

Kill Switch

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

Drive Motor Inverter Cooler

Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Radiator

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Radiator Control Fan Module

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Radiator Core Support Skid Bar Plate

Radiator Fan Cooling Motor

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Radiator Hose

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Engine Cooling

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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.

Peterbilt 378 AC Evaporator