can you plug the coolant crossover
TECH Regular
Joined: Jan 2004
Posts: 426
Likes: 4
From: Austin, TX
The elevation of the radiator or any other part of the cooling system is totally irrelevant. The tubes are there because there is no other way to get air out of the heads without them. Yes, you could bleed the air out of the tubes and then cap them, but you would have to do this every time you filled the cooling system. The air can not flow down into the block to get out. The tubes are at the top of the heads because that is where the air accumulates, and if you do not bleed it out, it will make the head run hot where the air is. When there is a pocket of air in the top of the head, then no water is in that section of the water jacket, why is that so hard to figure out? The engineers made an air trap in the heads of LS engines, but they resolved it with the bleed tubes, I would leave them in service. They did not put them in just for grins, they are needed to get the air out. Other manufacturers have had similar problems in other engines, and they have put in manual bleed valves to remove the air. GM chose to make the air removal process automatic, so why not take advantage of it? GM will not remove the air bleed tubes because they are needed. The routing through the TB on Gen III engines was just convenient. once they found out that heating the TB was not necessary, they removed the tube from the TB. They did not remove the air bleed tubes because they are necessary.
Regards, John McGraw
Regards, John McGraw
Measured it. Since you can measure the vacuum or pressure without actually contacting the chlorine solution in the pool water, I was trying to design an alarm system, to tell me my pump was cavitating without using a flow switch, since they got eaten up every year. So yes I know there was only 15" of vacuum there, actually, it was less then that most of the time. By the way most of the time when the pump cavitates, there is less vacuum present, then when it isn't. Using your 100K mile theory, since I only change my oil every 25K miles and have gotten over 250K miles on several of they doing that since new, it should be OK to do it an any vehicle, using any type of oil. I use Amsoil, but using your logic that should mater. In fact I've never had a motor fail, for an oil issue.
Can I get a translation on this comment from the LS1 Installation Manual:
Does the "fill bottle" equal a overflow tank?
Cylinder head air bleeds must connect to fill bottle or highest point of cooling system above coolant level.
TECH Resident
Joined: Sep 2009
Posts: 859
Likes: 2
From: Frozen Tundra, WI
It seems like blocking the steam line/vents and "burping" the system through the block-offs would make sure there isn't any air trapped. GM, likely, wanted to foolproof this system and not rely on some mindless hack (there are quite a few) to vent the system properly...a job well done, by the way. This eliminates any warranty issues related to human error and not venting the system when opening the cooling system.
Why do we mod/tune our cars, at all, if GM has engineered everything so perfectly??
Why do we mod/tune our cars, at all, if GM has engineered everything so perfectly??
Last edited by Paul57; Oct 17, 2009 at 03:52 PM.
There is a difference between the "catch/return" bottle as found on older cars...and the pressure sealed tank on modern cars.
You could return it to a pressured sealed tank, but not a standard vented tank.
You could return it to a pressured sealed tank, but not a standard vented tank.
as i read this thread i laughed for about ten minutes. "pissing match." "i can out **** you." you guys got to be kidding. anyway my solution is simple, if you dont want to tap the waterpump, tap the radiator like i did. all the books i read have the steam line running to over flow, radiator, heater core, or water pump. my suggestion to you is to send somewhere rather than just capping it. good luck.
