Volkswagen jetta heater core

Volkswagen jetta heater core DEFAULT

Volkswagen Jetta Heater Core Replacement

A heater core replacement is a critical service. The cost can vary greatly depending on the year, make, and model of your car.

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RepairSmith offers upfront and competitive pricing. The average cost for Volkswagen Jetta Heater Core Replacement is $ Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

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Volkswagen Jetta

L L4 Turbo Diesel • , miles

Portland ,  OR

$ - $

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Volkswagen Jetta

L L4 Turbo Diesel • , miles

Ladera Ranch ,  CA

$ - $

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Volkswagen Jetta

L L5 • , miles

Houston ,  TX

$ - $

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Volkswagen Jetta

L L4 Base • 90, miles

San Diego ,  CA

$ - $

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Volkswagen Jetta

L L4 Base • 90, miles

San Diego ,  CA

$ - $

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Volkswagen Jetta

L L4 GL • , miles

Tucson ,  AZ

$ - $

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Volkswagen Jetta

L L4 GLS • , miles

San Marcos ,  CA

$ - $

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Volkswagen Jetta

L L4 Turbo Hybrid Hybrid SEL • 55, miles

Palmdale ,  CA

$ - $

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Volkswagen Jetta

L L4 Turbo Diesel TDI SEL • 33, miles

Angwin ,  CA

$ - $

Last Updated:
Sep 7, PM

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What is a Heater Core?

This is likely to blow your mind, so get ready. The heater core is a key part of your car’s cooling system. In theory, the coolant system in your car is very simple. The water pump sends coolant around the engine, where it absorbs heat from the hard-working motor. The coolant then flows to the radiator. Cool air is blown across the radiator, lowering the temperate of the coolant inside. The coolant can then return to the engine to absorb more heat. By doing this repeatedly, the engine stays at a safe and operable temperature, which is good for everyone. Hot engine coolant also flows through the heater core, which is a type of heat exchanger. Air is blown across the heater core by a blower motor, allowing heat to transfer from the coolant into the cabin to keep you toasty. As with so many parts of your car, time and stress can take their toll on the heater core, and eventually it might die on you. And then your engine cooling system, and interior heating system will both be compromised.

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Symptoms of a failing Heater Core

Leaks inside the car

Cars use a lot of liquid, so leaks aren’t that uncommon. The heater core, however, is the one component in your car that will leak inside of the car. You’ll likely notice it as a puddle underneath the dashboard, though you might see it slowly dripping from the dash as well. Either way, that’s a sign that your heater core is having a tough time. Similarly, you may not notice the sight of the liquid, but you might notice the smell of it. If you smell coolant in your car, it’s probably the heater core.

Heater isn’t working

Your car’s cabin heater depends on the heater core in order to work. Without the heater core, there’s no way for the climate controls to actually get hot air. So, if the heater core fails, your car won’t have any hot air, or perhaps will have only a tiny amount of hot air. Fine in July. Not so much in January.

Windows are fogging up

Your windows may fog up for two reasons if your heater core fails. First, the car often relies on hot air when defrosting the windows, so it will struggle without that air. And second, the leaking coolant can cause a slight steam that will fog the windows to the point where you may not be able to see out of the windshield.

Coolant levels are low

Look, I’m not going to tell you how to spend your time. I’m just going to tell you that it wouldn't hurt to take a few minutes to check the fluid levels in your car. You might spot small issues before they become big issues. If you notice that your coolant level is low, you probably have a leak somewhere. That leak may be from the heater core.

Engine is overheating

Or, you can just do it the less responsible way, by not monitoring your coolant level, and just waiting for your engine to overheat. Your choice.

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How urgent is a heater core replacement?

That entirely depends on whether or not you like having a properly functioning coolant system and interior heating system.

If you shivering in your car while the engine overheats, and coolant puddles on the floor mat, then there’s no urgency at all! Otherwise, yeah. You&#;ll want to get it fixed asap.

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Related Volkswagen Jetta Repairs

AC Compressor Replacement AC Condenser Replacement AC Evaporator Core Replacement AC Recharge Expansion Valve Replacement Receiver Drier Replacement

Not sure? Let us diagnose

Other Repairs

Brake Caliper Replacement Brake Master Cylinder Replacement Brake Drum Replacement EGR Valve Replacement Brake Pad Sensor Replacement Brake Hose Replacement Transmission Mount Replacement Ignition Coil Replacement Oil Pressure Sensor Replacement Heater Hose Replacement Upper Intake Manifold Gasket Replacement Valve Cover Gasket Replacement Front Hub Assembly Replacement Front Lower Control Arm Replacement Rear Lower Control Arm Replacement Rear Stabilizer Bar Bushing Replacement Rear Oxygen Sensor Replacement Steering Rack and Pinion Replacement

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How to Replace the Heater Core in a VW Jetta

Items you will need

  • Replacement heater core

  • Hose clamps

  • Hose

  • Compressed air gun

  • Wrench

  • Screwdriver

  • Sealing rings

  • Engine coolant

How to Replace the Heater Core in a VW Jetta. Replacing a Volkswagen Jetta's heater core is simpler than most other cars. Since the core is located underneath the driver side footwell, it is easier to access than those located behind the dashboard. Still, you must use caution, since you are dealing with liquids like engine coolant.

Removing the Old Core

Unplug the Jetta's negative battery cable, making sure you have the radio's anti-theft codes to enter afterwards.

Take out the facing wall in the plenum chamber and place appropriate drip trays under the engine. Use hose clamps on the coolant hoses and disconnect the hoses from the heater core.

Drain the engine coolant carefully from the system. With a clean container under the core's lower connection, connect a piece of hose to the upper connection and blow coolant from the core into the container with a compressed air gun.

Disconnect the connection flange bolt linking the heater core connections so the coolant pipes can move.

Remove the trim and air vent from the driver side footwell, then remove the heater core trim. With strong foil and absorbent paper below the heater core, open the hose clamps and disconnect the coolant pipes, then remove the heater core.

Installing the New Core

Push the new heater core into the heating/ventilation unit.

Insert sealing rings coated with coolant into the connections on heater core. Connect the coolant pipes to the core, tighten the hose clamps (about foot pounds on newer models) and reapply the bolt to the connection flange.

Reconnect all other hoses and replace the engine coolant in the system. Look for any leaks in the coolant circuit for leaks, especially between the coolant hoses and heater core.

Connect the negative battery cable, then evacuate, charge and leak test the air conditioner. Let the Jetta's engine run to normal operating temperatures, then observe the climate control operation and double-check for leaks.


Always replace the sealing rings. Replace the hose clamps if they are deformed.


Make sure the clamps completely enclose the flange on the heater core and coolant pipe and don't touch any other components.

Writer Bio

This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more, see our about us page: link below.

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Heater Core (Mk4) (98 New Beetle Excluded)

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Heater Core

Alternate Part Number 1JA



This product fits


  • Mk4 Golf TDI with ALH Engine Code
  • Mk4 Jetta TDI with ALH Engine Code
  • Mk4 New Beetle TDI with ALH Engine Code
  • Mk4 Golf TDI with BEW engine Code
  • MK4 Jetta TDI with BEW engine Code
  • Mk4 Jetta Wagon TDI with BEW engine Code
  • Mk4 New Beetle TDI with BEW engine Code

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Core volkswagen jetta heater

Volkswagen Jetta - Heater Core

The heater core provides warm air in the cabin on cold days. Warm coolant from the engine passes through the heater core and the blower motor moves air over its heated fins and through your vents. With age, a heater core can leak or be clogged. If you notice a sweet smell in the vents, the heater isn't warming up or the windows aren't defrosting, these could be signs of a leaking or blocked heater core. Coolant on the vehicle's floor or below the cabin are also signs that your heater core may be leaking. Flushing a heater core may clear a blockage, but a leaky heater core must be replaced. Find the right heater core and parts for your repair at O'Reilly Auto Parts.

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VW PASSAT HEATER CORE 2009-2017? Replacement Volkswagen

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