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Overflow Tank Question

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Old Jul 18, 2005 | 06:42 AM
  #1  
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Default Overflow Tank Question

Having a senior moment here,,,,,,,,doesn't the radiator also pull water out of the overflow tank or is it for overflow only ???

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Old Jul 18, 2005 | 06:43 AM
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It's a storage tank. It will pull water out of there as well.
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Old Jul 18, 2005 | 09:49 AM
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expansion tank really not overflow. Expansion/contraction due to hot/cold.
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Old Jul 18, 2005 | 09:56 AM
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Do you need this?, I noticed I don't have one. Must of been removed by previous owner
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Old Jul 18, 2005 | 10:01 AM
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The 74 vette utilizes a plastic, non-pressurized recovery tank, mounted on the passenger fenderwell.
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Old Jul 18, 2005 | 10:09 AM
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Originally Posted by kodaclr
Do you need this?, I noticed I don't have one. Must of been removed by previous owner
depends on the year of your vette. I don't know when they started to include an overflow tank, or otherwise created a closed system. In 1968, even if there was an expansion tank, overflow hose went right to the street. It is a good idea to add an overflow tank if your overflow hose routes to the street. Prevents mess!
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Old Jul 18, 2005 | 11:16 AM
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Originally Posted by kodaclr
Do you need this?, I noticed I don't have one. Must of been removed by previous owner
If you have just a rad and it has a cap then yes you do since the rad will suck air in after cooling if no tank is present. The expansion tanks are set up pretty much like the plastic reserves except it is pressured and spits out directly to the ground but the rad will suck fluid from the exp tank back in as long as there is fluid present.
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Old Jul 18, 2005 | 01:12 PM
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I have a 1969 and the rad doesn't even have a overflow hose hooked up. It just has the nipple by the rad cap.
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Old Jul 18, 2005 | 01:19 PM
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Originally Posted by kodaclr
I have a 1969 and the rad doesn't even have a overflow hose hooked up. It just has the nipple by the rad cap.

Here's why I asked in the first place. I bought some Water Wetter and instead of waiting for the radiator to cool down and pouring it into it, I just poured it into the overflow tank. Than I got to thinking, Will this suck it into the radiator or not ???
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Old Jul 18, 2005 | 01:33 PM
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If the hose from the radiator to the tank is good and tight, it will...fill tank half full when cold
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Old Jul 18, 2005 | 01:40 PM
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For additives it is best to drain or suck some of the coolant out of the cold rad then put the additive in the rad so you know all if it gets into circulation within the cooling system.
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