eberspacher bn4

woofer · Posted: Wed Jan 22, 2014 4:29 pm Post subject: eberspacher bn4

Ok i know there are lots of posts about the heaters but here is another one. I want to install a bn4 into my 71 double cab (once its restored) i have a 6v heater which is immaculate but no good being 6v, a good 12v one and 2 boxes of bits. I am hoping most bits are there (no wiring loom but i could make that) but i have 2 timer switches for the dash, how many terminals should one for a bn4 have? I have one white and one black, both with 4 terminals but different part numbers, do they both do the same thing either for a bn4 or the 6?

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Ian · Posted: Wed Jan 22, 2014 4:47 pm Post subject:

Those switches work the same. Only difference is one is from a Type 4 and one is from a Type 3.

"963 107" is all that matters. The 411 is the Type 4, the 311 is the Type 3. The letter C is the 3rd or 4th revision of that switch.
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woofer · Posted: Wed Jan 22, 2014 5:01 pm Post subject:

are these for a bn4 or a ba6?
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tootype2crazy · Posted: Wed Jan 22, 2014 5:12 pm Post subject:

The BA6 switch has a rheostat in it to regulate temperature thus it has many, many more terminals. That is a BN4 or possibly a BN2 switch.
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busdaddy · Posted: Wed Jan 22, 2014 6:00 pm Post subject:

The black one is correct for a 71 bus or truck, terminals 15 and 30 are self explanitory, I can't recall off the top of my head which one of A & K is the ground for the light and which is the signal to the relay, look it up here: http://www.thesamba.com/vw/archives/manuals/bn4troubleshooting.php
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Tcash · Posted: Wed Jan 22, 2014 6:07 pm Post subject:

notchboy · Posted: Wed Jan 22, 2014 7:47 pm Post subject:

311 is for a BN2. Not sure if that relay works the same as for a BN4.
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woofer · Posted: Thu Jan 23, 2014 1:24 am Post subject:

Thanks for all the help. I will look to see what I have and look at the links figure out how it all goes together and bench test it. Cheers
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busdaddy · Posted: Thu Jan 23, 2014 7:45 am Post subject:

pittwagen · Posted: Fri Feb 28, 2014 9:47 am Post subject:

Not much info out there on how to install the BN4 in a double cab. The type2 site is down as is the vintage bus site. The 7 page bn4 manual in a double cab is not particularly clear as to the routing of the air hoses from the rear through the treasure chest area and on into the cab. Looks like there is a unique fresh air return plenum on the nose of the heater which is different from the bus one.

Any other references or pics? Thanks.

busdaddy · Posted: Fri Feb 28, 2014 10:50 am Post subject:

I'll get some pics in a few days, the truck requires a different outlet duct that's circular and straight, there's also a transition piece that goes on the LH tank closeout panel and an outlet grill similar to the ones in early Westfalias. I've never seen a recirculating heater in a truck, usually they just have the grill on the end and draw air from the engine compartment.

What year truck is this going into?
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woofer · Posted: Fri Feb 28, 2014 2:56 pm Post subject:

mines going in a 71 small rear light bay. haven't looked at routing the duct past the gas tank yet thats the least of my worries with this project! thought it would be straight forward but may have to have a better look
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pittwagen · Posted: Fri Feb 28, 2014 3:07 pm Post subject:

Early bay as well - pre 72.

busdaddy · Posted: Sat Mar 01, 2014 10:53 am Post subject:

Here's the truck only outlet duct, it's got a bimetal controlled damper in it to stop the icy draft when the heater isn't in use:

And another view also showing the inlet grill (it's the same as pre 72 bus):

There's a large paper/foil hose that connects to this fitting in the LH tank access panel (tank side shown):

Here's the front (treasure chest side) of that fitting:

Then there's another hose that leads to the seat pedestal on a DC or bulkhead just below the M plate on a SC, the metal sleeve in the end pushes into the fitting in the tank access panel and can be slid in or out to heat the treasure chest on a SC or underseat storage on a DC if desired. It's on the right in this pic which also shows the hangers that keep it up against the roof of the compartment:

Here's the factory cutout in the engine compartment for the heater install, there's a stamped depression there with the same shape in non heater trucks:

And another view from forward:

Make sense?
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Rust NEVER sleeps and stock never goes out of style.

Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!

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woofer · Posted: Sat Mar 01, 2014 4:07 pm Post subject:

wonder why the round tube coming out of the heater and not the rectangular as normal? is it just to do with the shape of hole in the bulkhead? the set up i have has the rectangular outlet feed
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notchboy · Posted: Sat Mar 01, 2014 4:57 pm Post subject:

Eberspacher was used in all kinds of applications in all kinds of different car makes. Ive seen that round snout used on large passenger bus applications for sure. Im sure that running that long tube up to the cabin made it more practical.
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busdaddy · Posted: Sat Mar 01, 2014 4:59 pm Post subject:

pittwagen · Posted: Sat Mar 01, 2014 5:00 pm Post subject:

Well done busdaddy. Thanks M.

woofer · Posted: Sat Mar 01, 2014 10:47 pm Post subject:

busdaddy · Posted: Sun Mar 02, 2014 12:04 am Post subject:


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