Hey guys,

So I have an FC, custom V-Mount Setup.

My question is: For the coolant overflow tank, one line goes into the engine, and one line goes into the radiator, correct?

When I picked up the FC, the other line wasn't connected to anything.. -_-

 

No. A line runs from the radiator cap to the overflow tank, and the other side is just open to atmosphere. Do not connect both sides to the cooling system.

 

when I got the FC, it had a custom V-Mount setup.

And the overflow tank is connected to the engine, but the other hose isn't connected to anything? There is no line connected to my Radiator.

 

Does you radiator have an overflow nipple on it?
If not don't sweat it.
..
My rad has an overflow nipple,and so does my Thermostat neck.Both have pressure caps on them,so what I did was run hose from both nipples to the Bottle,I TEE'd those 2 hoses together then ran it into the bottle.
.As my Good Friend RR88 said,the one side of the overflow bottle goes to the engine/rad..whatever..the other side of the overflow bottle cap is for Overflow,and goes to atmosphere.
If the Car expels so much coolant that it i smore than what the bottle can handle,then the coolant will go out that hose and Say "Bye,bye coolant".If your car gets that hot then something is Drastically wrong,has gone wrong,or is about to cost you BIG time!

 

No, my radiator doesn't have a nipple on it.

The overflow tank has two hoses and it T's off in the middle where the hose goes into the tank. When I got the car, like I said, 1 hose goes to the engine, and the other wasn't connected to anything. I guess that's the one that vents to atmosphere?

My car doesn't overheat at all.

Right now, I took off the hose that didn't connect to anything and put a hose plug on it. Is that alright?

 

yep.
As long as the hose going to the bottle is free of leaks and won't suck air,you are fine.
That hose needs to expel coolant and then take it back up from the bottle.
The best Term I have ever heard for the way that the cooling system works is that it is called a "give and take" system.It cuts out trying to explain how **** works..lol!

 

So it's okay that I covered the other hole with a hose plug?

That is very interesting, lol.

 

Unplug it.

If you get the engine to operating temp, you can have the coolant level in the tank rise all the way to to the top (depending on how full it was to start). If the second port is plugged, the cooling system will build excess pressure until something gives (ie your plug blows out, the cap blows off, or a gasket somewhere starts to leak).

 

So it's fine to just have a hose that expels to the atmosphere?

 

For the 3rd time, yes. The short hose off the coolant reservoir cap connects to nothing. That's how it was designed.

 

Okay, I'll throw the hose back on!

Sorry, lol. It just seems so unorthodox for me. I had a Subaru before this car so, everything coolant wise was pretty important. And I did have a coolant issue with the Subaru, haha.

 

I should do that. I just have the thermostat nipple linked to the overflow bottle and the radiator nipple plugged.

I always make sure my overflow tank is at it's full mark. After I run my car, all of the fluid in the overflow tank comes out, leaving the overflow empty. Is this proper? I've never really read much about the overflow.

 

It's always empty after you drive?

I don't think that's a good sign because when I did have the hose that vented to atmosphere, I barely lost any coolant. The tank would still be near full.

I just thought that having it vented was a bad thing, but I guess not.

But if you keep running out of coolant in your overflow tank, you might have a leak somewhere. It's draining all your coolant. That's how it was on my Subaru.

 

Comes out on the ground, or goes back into the engine? When the engine cools, it's supposed to pull the coolant back in from the reservoir. It should only spill out of the reservoir if you overfilled it. If there isn't a good seal on the line from the radiator cap, or the cap is defective, you could end up with it all over the ground. Whatever the level is when the engine is cold is what it should be at after the next heating/cooling cycle.

 

The overflow bottle acts like a under water seal. It allows for the colant to expand when hot and prevents air from getting into the system when the engine cools and sucks colant back. The hose from the engine or radiator connects to the cap of the overflow bottle which has a small hose (very important) which is submersed in the colant in the bottle. The other hose of the bottle just dangles out side.

 

I'll try a few different things.

Would higher pressure caps help?

 

NO.
The system is mean to Bleed off pressure at a certain PSI,the rating is on the cap.
If you go and screw with that and the cooling system is now under more pressure.Guess what happens?..
This is Cooling system 101 Guys.
Good clean system,good cap,thermo,Coolant,hoses,Bottle,Rad,Pump,belts,Fan of some sort...That's it.

 

Why do people even buy high pressure aftermarket caps then? (I never understood that.)

Hmm... The cap I have on the filler neck is new, my Koyo has been working great since I bought it a few years ago, the yoohoo belt helps quite a bit, I flushed the system in August of last year, hoses are all good, clutch fan has always been very reliable, I have the shroud and undertray, and good coolant/demineralized water mix.