[Tigers] Coolant queston

Wed Sep 9 11:35:33 MDT 2026

Yes, I think it is a recovery type!
How high is the coolant in the TIger tank?  If it is full, you are good
Gary Winblad

On Wed, Sep 9, 2026 at 9:13 AM Joe Brown <jbbrown1980 at gmail.com> wrote:

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