tb heater question with stupid diagram

[anisotropy]

http://img475.imageshack.us/img475/7508/dsc1266qq1.th.jpg (http://img475.imageshack.us/my.php?image=dsc1266qq1.jpg)
:o question as above (actually my writing is a mess, it says: to bypass throttle body heater plate do you just join 'a' and 'b')
alternately here (http://www.realoem.com/bmw/showparts.do?model=AF92&mospid=47256&btnr=11_1272&hg=11&fg=35)
just join #25 to #11. Apologies for my stupidity but maybe it will be useful to others.:rolleyes: Maybe my picture is a bit useless actually looking at it now but there really aren't enough diagrams.

[e9nine]

It's been covered a few times. Here's an article of help with a real oem diagram for accuracy(your chicken scratches make my eyes bleed) :D
http://www.m42club.com/forums/showthread.php?t=2422&highlight=delete

[anisotropy]

Well y'know I went to all that trouble and all..., So remove #11 and #16 and use some hose to join #25 to the cylinder head where #11 went in? So simple but for some reason confused me more the more I read about it.

[tjts1]

I'm not sure I can explain it by the numbers in that diagram but maybe my these pics help. Good luck.
http://www.m42club.com/forums/showthread.php?t=2742

[anisotropy]

So you bypassed lots of hoses there? rather than just the one to the heater plate?
I think I know what confused me there, in the realoem diagram I'm still not clear what hose #12 is, #11 goes from cylinder head to upper heater plate, #13 goes from upper to lower heater plate and # 16 completes the curcuit by going down to that plastic bit. Don't see #12. This makes no sense to anyone without their manifold and throttle body off, but did you bypass from #20 to where 12 goes into cylinder head? Thanks

[tjts1]

Hose #12 is a reinforcement that fits around the hose #11. Its just like a second skin and it didn't exist on my car. Hose #12 is described as "insulating hose" in the list.
Yes I bypassed everything from #11 to #20. You can think of this mass of hoses as a really convoluted heat exchanger. The system carries coolant from the side of the head to the pipe. A along the way it travels through 4 heat exchangers. The idle control valve, the crankcase ventilation and 2 throttle body plates. I eliminated all of these things and gave the idle control and the crankcase vent direct shots to the manifold.You just need to figure out where these hoses begin and end, then bypass everything. The idle control starts under the rubber elbow before the TB, and eds on the back side of the intake. The crankcase vent starts at the front of the valve cover and ends on the bottom side of the TB. If you eliminate everything under the intake you end up with 2 extra hoses that are much easier to access and service.

Here you can see the idle control valve hose on the right and the crankcase vent with the yellow filter in it on the right. The hose between the ICV (silver can looking think on the right) and the manifold is giving me some trouble right now. It tends to collapse from the vacuum which can make for slightly erratic idle . I'm going to replace it with a length of reinforced nylon vacuum hose.
http://farm1.static.flickr.com/243/524933649_afaefee6b9_o.jpg

That whole mess of hoses under the intake is replaced by a 1' length of 5/8" coolant hose. This hose connects between #11 and #20.
http://farm1.static.flickr.com/199/495150455_524b5fb898_o.jpg

The cooling system on this engine is retarded. A normal cooling system has 4 hoses. 2 for the radiator and 2 for the heater. This car has 20 coolant hoses about 10 vacuum hoses.

[e9nine]

The cooling system on this engine is retarded. A normal cooling system has 4 hoses. 2 for the radiator and 2 for the heater. This car has 20 coolant hoses about 10 vacuum hoses.

I beg to differ. The Vacuum systems is what's retarded. Try dealing with an m20 coolant hose system - now THAT's retarded :D

[anisotropy]

Thanks for the explanation I don't think even I could possibly misunderstand the whole throttle-body-heater-plate-bypass thing now;) I just did the http://www.m42club.com/forums/showthread.php?t=2422&highlight=delete method and ran hose #11 from #25 to the block. I'll save the proper hardcore big bypass for another day.
Kevin