i meant you can take the cap off the opt B tank when hot or not, whereas you cant do that with the engine coolant. Im just saying they cant be pressurized systems because there are overflows on both of them. If pressure were to build, it would just relieve itself through the overflow, which is why pressure cannot build.

 

LOL there is no open over flow on the system...it is a pressure release cap rated at 5 psi stock look at your cap! Loook at the redline bottle & cap on crate engine depot it is rated to release at 14psi thats the overflow. If the system gets to 5 psi stock the cap lets out the extra pressure via the overflow line just below the cap just like a radiator,,,,I have seen this happen. The option B changes the cap to 14 psi before it lets out the pressure via the overflow line just like on the reservoir I had made! If there was no pressure ever in the system....Why did they change the PSI rating from 1 cap to the other? Either way take my word for it or not...but every thing is designed for a reason.

 

Ever take the cap off the IC tank when the car is running and hot? The coolant rises and overflows out the system, just like the engine coolant would.

 

i have a guy now working on a dry ice tank that should be done tuesday

 

So is Hatrickstu's cooling mod not correct because it does not retain the pressure? I am running an extra tank w/ just the CXR h/e. I do not have a 1/4" hose running from the nipple on the top of the h/e to the top of the extra tank. Do I need to have a hose there to retain pressure or what?

 

If you are running a 5 psi cap on the stock system it's fine, the 1/4 hose is for the bleed line from the stock H/E & if the bottle isn't filling while running it sounds like it works! The system only pressurizes when it's hot,,, just like on the cap it says be carefull & never open hot. 5 psi isn't much pressure at all but 14 is. the system is designed to relieve the pressure if it gets to hot...because remember fluid exspands when it gets Hot which will create pressure in a closed system! Thats why they put the overflow on the system, if it never pressurized you wouldn't need a relief valve! Our intercooler are set up just like a radiator even when hot you can have the cap off & mine lets out fluid even then ...but once you put the cap back on it will create it's on pressure.
Look at it this way if you take a glass bottle & put water in it cold...then you heat the bottle pressure will increase in the bottle!

yup! hell when they 1st made my reservoir it had a small pinhole at the top corner on 1 of the welds & the reservoir was only half full...but fluid was coming out of the hole in the form of a drip...only thing to make that happen is pressure & it only did it while the cap was on!

 

Well I'm not running a pressurized cap or a bleeder line. I do not have the filler neck anymore. Just the CXR h/e and the extra tank. I can open the tank when its hot and nothing happens. Am I doing something wrong?

 

what cap are you running on the new reservoir

 

Just a plastic push on cap. It's just a generic tank from Autozone. Just like Hatrickstu

 

I haven't seen his or payed attention, but yea the stock neck had a relief cap rated at 5 psi that then released if to much pressure was built up & dump it out the overflow that is on the stock neck!
The option B tank is a redline tank...because on the redlines their engine coolant tank has a 14 psi relief cap, Our cobalts don't have a relief cap on the engine coolant reservoir!
But if it works it works, Remember 5 Psi isn't much at all!