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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>

Heater Core

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.

2004 GMC Envoy Heater Core

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