[Tigers] Coolant queston

[michael king]

Joe.

You describe how the system works..but without a specific recovery cap the
water cant get back into the header tank once its out.. it just becomes a
catch overflow

Regards

Michael King

On Wed, 9 Sept 2026, 19:57 Joe Brown, <jbbrown1980 at gmail.com> wrote:

> I've got the regular pressure cap on the original expansion tank and my
> understanding was that it would open up if the coolant was boiling over and
> the excess coolant would then flow into the catch can.  And then as the
> coolant cooled down it would be sucked back into the expansion tank.  Do I
> need some other kind of radiator cap?
>
> Thanks,
> Joe
>
> On Tue, Sep 8, 2026 at 5:50 PM Gary Winblad <winbladgary at gmail.com> wrote:
>
>> Joe,
>> Hopefully you also added the double seal cap?  You need that to make it a
>> recovery system, not just a catch can
>> With recovery, the overflow is pulled back in during cool down.  That is
>> what makes the radiator always full to the top,
>> for a few more tubes of cooling.
>> Gary Winblad
>>
>>
>> On Tue, Sep 8, 2026 at 3:21 PM Joe Brown <jbbrown1980 at gmail.com> wrote:
>>
>>> Hey,
>>> I added an overflow tank several years ago and I went with one I found
>>> on Amazon.  It's called an 800ml aluminum expansion tank from BDFHYK and
>>> it's around $25.
>>> [image: image.png]
>>>
>>> I wasn't using the remote oil filter, so I mounted this tank in the
>>> filter bracket.  This tank is slimmer than an oil  filter so I had to
>>> fabricate a new clamp to secure it.  Here is a photo.
>>> [image: PXL_20260908_220938306.jpg]
>>>
>>>
>>> Have Fun,
>>> Joe Brown
>>>
>>>
>>> On Tue, Sep 8, 2026 at 4:51 PM Mark L via Tigers <tigers at autox.team.net>
>>> wrote:
>>>
>>>> So, the plastic kit you mentioned will stand up to the heat of the
>>>> engine compartment okay?
>>>>
>>>> In a message dated 9/8/2026 5:18:10 PM Eastern Daylight Time,
>>>> winbladgary at gmail.com writes:
>>>>
>>>>
>>>> Mark,
>>>> IT is worth adding.  Cost and trouble are minimal. You can buy a kit at
>>>> the auto parts store (plastic tank, dual seal cap, tygon hose) for cheap.
>>>> Hard to say exactly how much cooling capacity it really adds..  it DOES
>>>> keep the radiator full to the top, the extra quart doesn't matter.
>>>> I put the tank in the wheel well behind the headlight, out of sight,
>>>> out of the way.
>>>> A very important reason to add is that it stops the leak of antifreeze,
>>>> which is toxic to small animals.  When we were in Big Sky for SUNI, we
>>>> stopped
>>>> into a small museum.  I will never forget the huge stuffed Condor on
>>>> display.  The placard said he died from driniking anitfreeze from an
>>>> overheated car... so sad, he was beautiful rare bird.  Please install
>>>> the system..
>>>> Gary Winblad
>>>>
>>>> On Tue, Sep 8, 2026 at 7:56 AM Mark L via Tigers <tigers at autox.team.net>
>>>> wrote:
>>>>
>>>> I know some have added an overflow to the expansion tank. This
>>>> seemingly allow the expansion tank to be filled to the top rather than only
>>>> 1/2 full.  Is the addition of an overflow worth installing?  It appears
>>>> this would add an additional  1 quart to the system.   How much difference
>>>> would this make on cooling?
>>>> Thanks,
>>>>  Mark L
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