[Tigers] Coolant queston

[Gary Winblad]

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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