BadassEFdriver

so I recently bought one of these all aluminum aftermarket coolant reservior tanks. only things is it doesnt seem to be sucking in or releasing water back into the radiator..if you see in the picture there seems to be an extra hose that comes out on the left side of the tank and just cut off..i plugged this up as you can see when I installed it..do i need this hose in order for it to breath and suck/release water?? i would think coolant would just leak from here thats why i plugged it up, so any suggestions? should i jus mount it upside down?

BadassEFdriver

So any help here guys?

IO_303

Well if you plugged your vent tube you will be causing issues. The vent tube should be open since the top looks air tight. There should be another siphon tube that should lead to a tube that will suck coolant from the bottom of the reservoir.

hatchet_honda

thats a coolant tank? looks like an oil catch can to me...hmmm theres 2 spots to attach a hose? id think an overflow tank would just have one. one that attaches to the radiator and thats it.

import2nr88

Unplug the hose there. By plugging that hose you esentially made a closed system that has no way of letting anything in or out.

Also on the inside of the can where the nipple is that leads to the radiator, is there a hose that goes from the nipple down into the coolant?

**Damn, three replies with in a minute.

BadassEFdriver

Yes I have that nipple part going to the from the tank to the radiator..and no, i even asked weaponR if there was a hose going from the nipple to the bottom of the tank but theres nothing. I ask em it needs to be mounted upside down with the cap facing the floor but he said no?? so you think i should leave that hose open there?

SohcZcCrx

On your car, the "overflow tank" is simply for overflow purposes, it serves as a catch can for excess coolant so it doesn't make its' way to the ground. Coolant is poisonous and animals are attracted to it. It can be sealed or open, it makes no difference. There should be one hose from the radiator neck to the overflow tank, and that's it.

It is physically impossible for a honda radiator to draw coolant back into the car. The cap has to open in order for anything to make it down the hose into the overflow tank, and the only ways that's possible is if the pressure is too high, meaning it is too hot, or if you've completely filled the coolant so far that when it heats up and expands, the radiator cap is lifted, the excess coolant is pushed through the hose, and the coolant overflow tank catches it.

That's the correct function of the piece. It should be empty really.

Thanks.

OneBadTurboCRV

Stop giving out information so authoritatively when only half of what you said is right.

You want ZERO air pockets in a coolant system. A coolant system is a hydraulic system and therefore only operates as designed when air is absent. Due to these requirements it is impossible to overfill a coolant system without creating pressure while filling it. When there is air present in the system it effectively stops the cap and system from working properly. Due to the coolant contents it expands when it is heated. When this happens the excess is pushed into the resivoir, thus lowering the amount of coolant in the system. When it begins to cool it sucks fluid back in (which the line should be free of air because of proper coolant resivoir level). If you were to have an empty tank the cycle would not complete itself; then you would have air being sucked back in with the cooling stage. This would lead to hot spots, possible cavitation, improper thermostat operation, or ect... All this and I am just putting it lightly, I'm tired of explaining already...

Essentially a properly filled resivoir is just as important as a properly filled coolant system. There is a reason the cap is rated for a certain pressure as well and changing it actually has an effect.... I'll save that for some other time.

P.S. If you still don't get it then why does all factory cars made have a "Cold" fill line and or a "Hot" fill line. Think about it kid.