[Tigers] Coolant queston

Wed Sep 9 10:13:13 MDT 2026

I went back and looked at my cap.  Everything I've read says that the
recovery style caps have two seals; one at the top of the cap and one on
the spring loaded part.  Here is a photo of my cap.  Can I assume that I
have a recovery style cap?
[image: PXL_20260909_160805998.jpg]

Thanks,
Joe

On Wed, Sep 9, 2026 at 7:00 AM michael king <michael.s.king at gmail.com>
wrote:

> 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
>>>>> _______________________________________________
>>>>>
>>>>> tigers at autox.team.net
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>>>>>
>>>>>
>>>>> _______________________________________________
>>>>>
>>>>> tigers at autox.team.net
>>>>>
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>>>>>
>>>>> _______________________________________________
>>
>> tigers at autox.team.net
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