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Fri Nov 04, 2005 10:48 pm

I would like to know if anyone knows how the type 4 heating system works.Their is a picture in the gallery that I put up.I took this picture from under a 412 and the junk yard.I have a type 4 in my type 3 and have type 4 exhaust manifolds.Trying to figure out how to hook up the hoses and still have the functioning flaps to turn the heat on and off.

Sun Nov 06, 2005 3:56 pm

How big are your heater boxes??

The reason I ask: 90% of the type4's [411/412] used BA-4 gas heaters and therefore did not use full size heater boxes like on 72-74 buses.

The mini-heater boxes were just preheaters for the BA-4 heater.

I just went and took a pic of the two different heater boxes. The lower one is the 411/412 mini box. Thr upper one is 72-74 bus. I used both lefts for an example, rights are the same as the lefts, just opposite.

As you can see, in reality they are shell covered J pipes. I can take another pic showing the difference inside if anyone wants to see.

Mon Nov 07, 2005 1:07 am

Karl I have the lower pic heater boxes.(Smaller Ones)I want to see if I can hook them up like the bus or what. I see the 412 heater thin above the tranny but how it works?The pics in the gallery. Thanks.

Mon Nov 07, 2005 11:09 pm

I put the complete VW heater book here:
http://failsure.net/oacdp/ebersp.html

After you click on the link, scroll down.
The type 4 section starts at Full Index and click Type 4.

1st page, 005, shows a pic of the system. I cannot post the pic here. It is a .png and not allowed.

Tue Nov 08, 2005 8:56 am

thanks for the wesite Karl! It explained it perfectly.Now I have to figure out how I am going to hook up my heater boxes with the bus heater flaps so when I am warm enough I can turn it off. :lol: