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Heater/defrost question
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MConstable
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Joined: May 04, 2004
Posts: 1676
Location: Coral Springs FL
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PostPosted: Tue Oct 31, 2017 5:16 am    Post subject: Heater/defrost question Reply with quote

Quick troubleshooting question....
I just replaced my heater box levers and put a new thermostat and flaps in (po just wired everything open), I have heat but no defrost, this one has me puzzled.
Thanks in advance
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mondshine
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Joined: October 27, 2006
Posts: 1906
Location: World's Motor Capital
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PostPosted: Tue Oct 31, 2017 9:07 am    Post subject: Re: Heater/defrost question Reply with quote

Take a look at this drawing...
Image may have been reduced in size. Click image to view fullscreen.


Notice the little diverter flaps which are located inside the "Y tubes" under the rear seat bench. The flaps are operated by a cable connected to the lever closest to the driver's seat.

Here's a photo from the gallery:
Image may have been reduced in size. Click image to view fullscreen.

Good luck, Mondshine
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MConstable
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PostPosted: Tue Oct 31, 2017 10:18 am    Post subject: Re: Heater/defrost question Reply with quote

Thanks for the quick reply.
Those flaps are working and Iím only getting heat out of one side.
On defrost mode the tube going from the floor to the dash used to get almost too hot to hold, not so anymore.
Iím thinking a disconnected heater hose or bellows or too much play in my heater box levers where they barrel clamp to the cabin cables?
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FV195
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Joined: February 19, 2005
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PostPosted: Wed Nov 01, 2017 4:07 pm    Post subject: Re: Heater/defrost question Reply with quote

Once you get heat flowing, youíre counting on fan speed to blow air, I added a 12v booster fan inline above the tunnel. It even pulls heat into cabin and will stand streamers up the windshild
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74 Thing
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Joined: September 02, 2004
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PostPosted: Wed Nov 01, 2017 10:21 pm    Post subject: Re: Heater/defrost question Reply with quote

Got any photos?
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FV195
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PostPosted: Thu Nov 02, 2017 7:29 am    Post subject: Re: Heater/defrost question Reply with quote

Not at this time, my car is in storage at the local navy base, Iíll try to get some ASAP, fan came with a 4 position switch, off low, med, high. Now itís wired to a on off switch, high only
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Wildthings
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Joined: March 13, 2005
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PostPosted: Thu Nov 02, 2017 1:17 pm    Post subject: Re: Heater/defrost question Reply with quote

Pull things apart and get the mice nest out of there. Standard VW annual maintenance, should be shown in the manual as it is way more important than a lot of this they do tell you to do.
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