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.
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.
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.
Topic: tb heater question with stupid diagram (Read 5759 times)