2nd Coolant tank Necessary?
 

Is the second coolant tank necessary? I would like to remove the one located by the paasenger side light. I have an aluminum overflow tank mounted and was wondering if you actually need the second tank.

When you mention that you have an aluminum "overflow tank", I'm assuming that you actually mean that you have an aluminum AST -- air separator tank. Yes, you still need the overflow tank -- where do you think the coolant is going to go when hot and under pressure?

Why do you want to remove this in the first place?

weight reduction what else?

Bah, I see too many people here doing, IMO, stupid things to achieve "weight reduction". And then those same people install a heavy subwoofer and even heavier 18-inch wheels on their cars.......

I'm almost positive that the plastic overflow tank near the passenger side headlight on my 93' had been disconnected or bypassed from the coolant system when i got it last year. When i had my coolant changed in the late fall, they took a sample from the water in the overflow tank, and it looked like swamp water. So I let them flush out my coolant. This didn't fix the problem that there was still muddy water in the overflow tank though. So since the coolant mixture in my AST is light green, and the overflow tank looks like a swamp (no green color from coolant present at all), i guess its not hooked up

I haven't actually dug under there to check it out yet, but my car seems to run fine and at the normal running temperature. Anyone have any advice thinking the tank could still be hooked up and able to run fine with that kind of water and dirt in the overflow tank?

I actually took mine out when I was installing my new radiator. But I only took it out to wash all of the fluid out of it. Mine had some nasty oil looking stuff in it. It takes all of 10 minutes to do.

I'm almost positive that the plastic overflow tank near the passenger side headlight on my 93' had been disconnected or bypassed from the coolant system when i got it last year. When i had my coolant changed in the late fall, they took a sample from the water in the overflow tank, and it looked like swamp water. So I let them flush out my coolant. This didn't fix the problem that there was still muddy water in the overflow tank though. So since the coolant mixture in my AST is light green, and the overflow tank looks like a swamp (no green color from coolant present at all), i guess its not hooked up

I haven't actually dug under there to check it out yet, but my car seems to run fine and at the normal running temperature. Anyone have any advice thinking the tank could still be hooked up and able to run fine with that kind of water and dirt in the overflow tank?

Weight? NO!
 

I am not taking it out for weight savings, it is plastic for gods sake. I want to take it out because i am putting in a Cwest headlight kit and i have a T78 single turbo and i want to run the air piping and filter where this tanks sits so i can take advantage of my C-West front end.

yank it and let us know, i want mine out too

Yeah i mean the excess coolant will just drain out, it does that out of the overflow tank anyway when it has enough fluid. I will yank and let you know what happens.

Well I guess if you are running Evans coolant then you don't need it, especially if you are running 0 PSI.

Huh? Even Evans expands under heat, even in a 0 psi system. And there better be some way of getting coolant BACK into your system on cooldown, or you'll be geting a new engine soon! If you have to pull the stock overflow, at least put SOME kind of overflow/drawback system in the car. Just PLEASE don't use a drinking water bottle. That's just SOOOO mid seventies camaro!!!

I would argue that it is a very necessary part. The tank that you are talking about is the coolant over flow tank and without it you are going to end up with air bubbles in your coolant system dew to contraction of the coolant during engine cool down. This can lead to hot spots within your engine block which is not good at all.

Yep-

If you don't have a place for the excess to go when hot, or just let it 'drain out'; then the car isn't hot there will be air in the system. That will then be air in odd places in the system when you start back up... Leads to hot spots.... You get the idea.

Boom. All for a plastic tank.

But, you can put it elsewhere and get what you are after. Good luck.

J