Question about 2000 Volkswagen Beetle

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How to backflush 2000 vw beetle gls 2.0l - 2000 Volkswagen Beetle

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  • Tommy Oct 16, 2013

    back flush the heater coil.. figured it out.. Thanks..just trying to do repairs myself..

  • 16VJohn Oct 16, 2013

    Np! Just FYI, a treasure trove of information about these cars is available at also . Even if you don't have a TDI, there's lots of info there that's not engine specific. The search tools are a little hard to use, but once you figure it out you can find almost any solution or others experience similar issues.

  • Tommy Oct 17, 2013

    Thank You!.. next is to replace the heater coil.. no hot air.. Removed and tested the thermastat and its ok. Just trying to get her in better running order.. after that I've got to replace the catylic convertor thats dring me nuts rattling.. But Thank You for your time and advice.. It's most Welcomed any time

  • 16VJohn Oct 17, 2013

    I wonder if the heater box mixer flap is malfunctioning... The heater coil is hot all the time regardless of setting, coolant never stops flowing through it, even in the summer. There are two smaller coolant hoses on the firewall under the hood (might be hard to get to on the beetle) but you should be able to put hands on both hoses. If both sides are hot, you know coolant is flowing. If one side is hot/warm and the other is cold or much cooler by comparison, you know there is a clog. Very rarely do these heater cores clog up. I'll bet the cable from the temperature selector dial is disconnected or broken.

  • Tommy Oct 17, 2013

    I will check that out.. I wondered about that and was going to look into that this weekend as using it this week to commute to work.. I've read a few reports about different issues and thought maybe I would be having overheating issues if the coil was restricted wouldn't you think.. Thank You for the tips.. right now I can buy more bandaids than I can shop time.. I took care of the cabin air filter and the buld in the fan speed selector last nite.. Now I can see the controls!..Keep the tips coming..

  • Tommy Oct 18, 2013

    Update, took the temp control out and the cable is attached and working at the switch although to me seems to have no resistance as I think it should have if connected to the blend door as it should. I didn't have enough time but plan to look up how to acess the blend door to inpect. If I find nothing is wrong there I amd going to check the heater hoses as you said to make sure both are equal in heat for coolant flow.. Thank You for the tips.. enjoy tracing issues and fixing myself

  • Tommy Oct 21, 2013

    Update, Was able to hear the Blend door opening and closing(actualy heard it slap shut).. I started the car and felt the 2 heater hoses in which one soon got hot and the other only heated up from the transfer of heat from one to the other being as close as they were and the engine warming up. So I think my issue is the heating coil is stopped up or restricted. I understand it best to replace as I won't be able to flush out with a garden hose effectively?..

  • Tommy Nov 12, 2013

    Update. Replaced Catalytic Convertor, Back flushed the heater core with water and air pressure finding no blockage or trash. What I found was the blend door had lost ALL the factory applied foam allowing the cold and hot air to mix thus no heat.

  • Tommy Nov 12, 2013

    Thank All for the tips and video's.. I've learned a lot and have other projects scheduled to get the beetle up to par.



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What do you mean by "backflush"? I've never heard of that term before. What system are you trying to work on?

Posted on Oct 16, 2013

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  • 16VJohn Oct 17, 2013

    If the heater core is clogged, that will not cause over heating. There are actually two circuits for coolant. The first circuit uses the heater core when the thermostat is closed. Obviously so the engine can warm up faster and heat provided sooner. When operating temperature is reached, the thermostat opens and allows the radiator to cool the engine. If the heater core is clogged, the engine will reach operating temperature sooner and the radiator will take over. Point being, clogged heater core shouldn't cause overheat. --- Now that I am thinking about it, I think the temperature selector knob might be electronic on the beetle. I can't remember if it's cable actuated or electronic. Either way, that's where I would look first if your heater performance is lacking.

  • Tommy Oct 17, 2013

    I think you are correct.. I will start there and see.. What would I look for or notice to prove the control is bad?.. I will watch video at home.. Again Thanks.. your advice is greatly appreicated!

  • 16VJohn Oct 17, 2013

    I'm happy to help those that are willing to learn and perform repairs themselves. VW's can be love/hate, but they are much more satisfying cars if you know how to repair them yourself. --- I did some research, the flapper is cable actuated. Either the cable is disconnected or the knob is broken. Take the climate control knob assembly out and investigate. Hopefully it's not he heater core as that requires dashboard removal.

  • Tommy Oct 17, 2013

    Thanks!.. Man your a lifesaver. No.. I don't mind doing it myself.. Got to replace the cataltyic converter next.. it's rattling.. driving me nuts.. By the way.. if you send more comments within the next few hours.. don't worry.. got a meeting to attend.. You know anything about GM 3.4L?.. I got one I think has a broke camshaft(next project).. Thanks Again!

  • 16VJohn Oct 21, 2013

    If the heater core is really clogged, that leads me to wonder about other issues. There just shouldn't be enough floating around the coolant system to do this. I would definitely try the garden hose idea. Thing about that, you have to disconnect the hoses anyway, you might as well see if you can use the pressure of the garden hose to clean out the heater core. Try the garden hose on both sides of the coil. Replacement of the heater core requires complete removal of the dashboard and partial removal of the HVAC box. This is not a casual project and I would strongly discourage attempting to do it yourself unless you are 100% confident and prepared for the possibility of taking it to a shop anyway.



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