water line to throttle body - needed?
#1
Staging Lane
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water line to throttle body - needed?
There is a water line that is supposed to be hooked up from the radiator to the bottom of the throttle body. I assume it is to warm the throttle body? How necessary is it? To hook this into my radiator would be a big PITA.
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Ditto on it not being needed. (Mine is disconnected)
However, I can't help but to wonder why it's there in the first place. I can't see that it does anything for emissions, so my next guess would be that it helps for those with cars in colder climates...
However, I can't help but to wonder why it's there in the first place. I can't see that it does anything for emissions, so my next guess would be that it helps for those with cars in colder climates...
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Isn't the setup that the heads both have steam vents at their tops - hard lined together, then through throttle body, into radiator? Purpose is to get air out of the coolant system. Do not need to go through throttle body (also understand there for cold climate cars), but should route the two head steam lines back into coolant system somewhere (recall I ran mine to an adapter in one of the heater lines).
I think I have heard some just cap them off and works for them ....
I think I have heard some just cap them off and works for them ....
#7
sawzall wielding director
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You can bypass the TB, the coolant line only goes through the TB to warm it up in cold weather for better driveability/emissions.
You should still connect a line from the steam ports on the heads to the radiator. Those ports are there to bleed any air out of the tops of the heads. Some people say that you can get away with capping them off and just bleeding them when you fill the engine with coolant.. but if you run it like that and an air bubble gets in the engine it could get trapped at the top of the heads and create an air pocket/hotspot
You should still connect a line from the steam ports on the heads to the radiator. Those ports are there to bleed any air out of the tops of the heads. Some people say that you can get away with capping them off and just bleeding them when you fill the engine with coolant.. but if you run it like that and an air bubble gets in the engine it could get trapped at the top of the heads and create an air pocket/hotspot
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#8
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I thought about routing the steam lines to the top of the radiator overflow reservoir - would that work, or would there be too much pressure bleeding off?
#11
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where is the air comming from?
there is lots of talk about air or steam in the system. if it is properly filled where is the air comming from? I have a snap on tool that actually pulls the cooling system into a vacuum and then fills it to avoid any air pockets in the engine. wouldn't that work?
#13
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Where the steam is coming from is the fact that some of the Coolant will boil in the top of the Heads, it just does. That steam rises and goes through the lines, and it condenses pretty much in the lines and turns back to Coolant. As far as air goes, anything can happen.
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#15
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GM actually plumbed some trucks into the heater hose near the water pump so it does not need to be plumbed in that high. Water pump connection works fine, I have mine on top, have seen others done on the front of the pump. Of course, different swaps have different needs.
Pat
Pat
#16
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Do a search here. There's been plenty of posts on where to put the steam line. Either drill and tap the top of the WP, or put a provision on the radiator. I had a spot in my afco radiator so I just screwed in a nipple and attached the hose..
Tails
Tails
#17
The fact is a lot of people have blocked the vents without any of the problems everyone else is guessing at.
I unbolted one to let the air out while filling the cooling system. Took forever otherwise.
I unbolted one to let the air out while filling the cooling system. Took forever otherwise.
#18
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The reason the vent is there is to prevent icing of the throttle blade and the TB bore in cold climates. Its similar to the leading edges of aircraft wings having high temperature engine exhaust running through them.
I drilled a hole in the water neck (truck water pump) and cut the barb off another crossover. I had the barb welded to the water neck, it works great and looks real clean
I drilled a hole in the water neck (truck water pump) and cut the barb off another crossover. I had the barb welded to the water neck, it works great and looks real clean
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The reason the vent is there is to prevent icing of the throttle blade and the TB bore in cold climates. Its similar to the leading edges of aircraft wings having high temperature engine exhaust running through them.
I drilled a hole in the water neck (truck water pump) and cut the barb off another crossover. I had the barb welded to the water neck, it works great and looks real clean
I drilled a hole in the water neck (truck water pump) and cut the barb off another crossover. I had the barb welded to the water neck, it works great and looks real clean