How VW Parts Fail ~ Heater Cores

VW heater core clogged

VW heater core cloggedIt has been a while since the last “How VW Parts Fail” video. But I have an awesome one for you today. This is the time of year we see the most failing heater cores. That makes sense because this is the time of year that most folks start using their heat. There are a few things that a failing heater core can cause. We are going to jump right in and talk about how heater cores work, and how they fail!

Sponsor Of The Day
Today’s show is sponsored by Deutsche Auto Parts. They are the VW and Audi parts experts. They have great prices and awesome service. Plus they work really hard on a ton of VW DIY videos. Paul and the fellas at DAP are awesome. Also check out their new site at

Join me as we break down:

  • What is a heater core
  • Where are most heater cores located
  • How do heater cores work?
  • The roll coolant plays
  • How heater cores fail
  • Can they cause a Check Engine Light when they fail?
  • Can you repair a heater core?
  • Diagnosing a bad heater core
  • Flushing a heater core
  • and more

Trouble viewing? Watch “How VW Parts Fail ~ Heater Cores” on YouTube.

As always, your questions and comments are welcome.
Please post them below. If you would like to suggest a part of a show like this, email me Charles(at)HumbleMechanic(dot)com. Thanks again to Deutsche Auto Parts for being such a great sponsor.VW heater core clogged

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4 replies
  1. Mitch
    Mitch says:

    Replaced the heater core in my 1986 VWGolf diesel but am not sure of which hose goes to which heater core outlet. Does it matter for correct flow? I am looking at the.hoses that go to the engine block.


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