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Simple explanation...Because coolant needs to flow thru the intake to eliminate a possible hot spot, it needs to flow back to the overflow to help reduce overpressurization in the area, and not be stuck and stagnant due to being blocked off. Make sense?
No. Your explanation does not make sense.
The primary path for coolant to leave the intake is the outlet pipe, which has an inside diameter of ~1 inch (#8 in the attached illustration).
Next largest is the heater inlet pipe (#4). Its inside diameter is ~½ inch.
Those two outlets allow for all the coolant flow out of the intake that's needed. The nylon line from the TBH to the expansion tank has a I.D. of 5mm (#7). If the cooling system in a DII needs that third, tiny outlet from the intake to keep temps in an acceptable range there are much bigger problems.
And cooling system pressurization is managed via the expansion tank cap,
No. Your explanation does not make sense.
Make sense?
Sorry, those were just my thoughts, as mistaken as they may be. And I apologize if my ability to be tactful is on the fritz today, my bad, I honestly meant no harm...
Last edited by RA122125; Oct 17, 2022 at 09:33 PM.
All done. Feels great to get that out of there. One less leak to worry about.
I opted to just run a new hose from the intake manifold to the tank and removed the TBH ports and hoses altogether. I don't think there's a problem doing either method discussed here, for me I just preferred the aesthetic and simplicity of a single return hose. ¯\_(ツ)_/¯
I have seen the version of TBH delete via just blocking off the 2 lines, and a few did have some nasty sludge build up behind the bolts they used to seal them closed. I prefer to just run a new line from the intake to the coolant reservoir.
If you look at the coolant flow diagram, you'll see that the ONLY thing in that circuit is the TBH. There's no reason to connect the two lines together.
If you look at the coolant flow diagram, you'll see that the ONLY thing in that circuit is the TBH. There's no reason to connect the two lines together.
As someone up above said, I blocked off a TBH once by just sticking bolts in the end of the line (removed from throttle body heater connections), then clamping off. And in less than 18 mos, both lines filled up with sludge at least a good 12-15" into the lines. This sludge could, I guess, get into the rest of the system. Connect them together and keep the flow moving...
