<div dir="ltr"><div>Joe,</div><div>Yes, the stock system is faulty. It will blow off coolant down to a low level in the stock tank. If you look, that level is not as high as the top</div><div>of the radiator, therefore, the top rows of the core don't have fluid, so no cooling from them! Shelby put that tank too low, on his Cobras</div><div>it is higher up above the radiator... thanks 'ol Shel... Some guys have success locating it up by the firewall, where they remove the brake</div><div>servo. (not recommended)</div><div><br></div><div>Adding a recovery tank with the recovery cap will allow the stock tank to stay at the top. When the coolant gets hot, it expands which will</div><div>just go on the ground with the stock system but now into your recovery tank. When it cools, it gets drawn back into the stock tank like it</div><div>has a straw and it is sucking it back up. The port in the expansion tank needs to be at the bottom so it will always suck liquid.</div><div><br></div><div>I would fill your stock tank to the top when cool. Put just a little in your expansion tank. Now drive it to get it real hot. If nothng comes out</div><div>of the expansion tank (it should have its own overflow tube at its top), you are good. Now after it all cools down, open your cap.. the stock</div><div>tank should be full and you should always keep a little at the bottom of the expansion tank. A transparent tank like a modern car lets you</div><div>see that, your trick aluminum tank doesn't so you need to take its cap off and look inside. The expansion tank is not sealed to the atmosphere</div><div>so coolant will evaporate over time and you need to add some to that tank. Mine is up under the fender, kind of a pain to add, I use a left</div><div>over wine bottle, its skinny neck works great.</div><div>Gary Winblad</div><div><br></div><div><br></div><div>Gary Winblad</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Sep 9, 2026 at 11:20 AM Joe Brown <<a href="mailto:jbbrown1980@gmail.com">jbbrown1980@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">When I first got the car running I didn't know how much coolant to have in the expansion tank so I started out with it filled up. It boiled over pretty quickly so I kept experimenting with it until I found a level that didn't puke; maybe about a quarter full. I added the overflow tank later just in case. I suppose I could fill the expansion tank back but I haven't bothered. <div dir="auto"><br></div><div dir="auto">I tried using a 13psi cap but it blew a radiator hose off, so I went back to a 9psi cap. I also read that the higher pressure could be hard on the heater core. I also installed an electric fan that comes on at 190 degrees and I haven't had any other issues.</div><div dir="auto"><br></div><div dir="auto">Thanks, </div><div dir="auto">Joe </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 9, 2026, 12:35 PM Gary Winblad <<a href="mailto:winbladgary@gmail.com" target="_blank">winbladgary@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Yes, I think it is a recovery type!</div><div>How high is the coolant in the TIger tank? If it is full, you are good</div><div>Gary Winblad</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 9, 2026 at 9:13 AM Joe Brown <<a href="mailto:jbbrown1980@gmail.com" rel="noreferrer" target="_blank">jbbrown1980@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">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?<div><img src="cid:ii_mtuark1x2" alt="PXL_20260909_160805998.jpg" width="423" height="562"></div><div><br></div><div>Thanks,</div><div>Joe<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 9, 2026 at 7:00 AM michael king <<a href="mailto:michael.s.king@gmail.com" rel="noreferrer" target="_blank">michael.s.king@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>Joe. </div><div dir="auto"><br></div><div dir="auto">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 </div><div><br></div><div>Regards<br><br>Michael King</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 9 Sept 2026, 19:57 Joe Brown, <<a href="mailto:jbbrown1980@gmail.com" rel="noreferrer" target="_blank">jbbrown1980@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">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?<div><br></div><div>Thanks,</div><div>Joe</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 8, 2026 at 5:50 PM Gary Winblad <<a href="mailto:winbladgary@gmail.com" rel="noreferrer noreferrer" target="_blank">winbladgary@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Joe,</div><div>Hopefully you also added the double seal cap? You need that to make it a recovery system, not just a catch can</div><div>With recovery, the overflow is pulled back in during cool down. That is what makes the radiator always full to the top,</div><div>for a few more tubes of cooling.</div><div>Gary Winblad</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 8, 2026 at 3:21 PM Joe Brown <<a href="mailto:jbbrown1980@gmail.com" rel="noreferrer noreferrer" target="_blank">jbbrown1980@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hey,<div>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. </div><div><img src="cid:ii_mtt8d5r50" alt="image.png" width="562" height="297"></div><div><br></div><div>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.</div><div><img src="cid:ii_mtt8gxwj1" alt="PXL_20260908_220938306.jpg" width="283" height="376" style="margin-right: 0px;"><br></div><div><br></div><div><br></div><div>Have Fun,</div><div>Joe Brown</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 8, 2026 at 4:51 PM Mark L via Tigers <<a href="mailto:tigers@autox.team.net" rel="noreferrer noreferrer" target="_blank">tigers@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<div style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:16px"><span style="color:rgb(0,0,0);font-style:normal;font-weight:bold">So, the plastic kit you mentioned will stand up to the heat of the engine compartment okay?<br></span></div>
<br>In a message dated 9/8/2026 5:18:10 PM Eastern Daylight Time, <a href="mailto:winbladgary@gmail.com" rel="noreferrer noreferrer" target="_blank">winbladgary@gmail.com</a> writes:
<div> </div>
<div>
<blockquote style="padding-left:5px;margin-left:5px;border-left:2px solid blue">
<div id="m_7236370616193137616m_-8789372996607391604m_7172331516504797537m_-1591867085722863866m_-5284461069837002937m_3908757174784102964m_7782981683687211637m_-2450442671094333224m_-1907123691599327726yiv4472515349">
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<div dir="ltr">
<div>Mark,</div>
<div>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.</div>
<div>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.</div>
<div>I put the tank in the wheel well behind the headlight, out of sight, out of the way.</div>
<div>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</div>
<div>into a small museum. I will never forget the huge stuffed Condor on display. The placard said he died from driniking anitfreeze from an</div>
<div>overheated car... so sad, he was beautiful rare bird. Please install the system..</div>
<div>Gary Winblad</div>
</div>
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<div>
<div id="m_7236370616193137616m_-8789372996607391604m_7172331516504797537m_-1591867085722863866m_-5284461069837002937m_3908757174784102964m_7782981683687211637m_-2450442671094333224m_-1907123691599327726yiv4472515349yqt02517">
<div dir="ltr">On Tue, Sep 8, 2026 at 7:56 AM Mark L via Tigers <<a href="mailto:tigers@autox.team.net" rel="nofollow noopener noreferrer noreferrer noreferrer" shape="rect" target="_blank">tigers@autox.team.net</a>> wrote:</div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:16px"><span style="color:rgb(0,0,0);font-style:normal;font-weight:bold">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?<br clear="none"></span></div>
<div style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:16px"><span style="color:rgb(0,0,0);font-style:normal;font-weight:bold">Thanks,</span></div>
<div style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:16px"><span style="color:rgb(0,0,0);font-style:normal;font-weight:bold"> Mark L</span></div>
</div>
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