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Been a year since adding the modified catch can and all is working well. After talking to a radiator guy that specializes on the older hot rods like mine I understand why it works and learned that...

Still working perfectly, no drips, no runs, no air!

Now that that ones done, it's on to tuning my headlight/parking light/ parking brake on warning reminder circuit.

Jegs Performance Products 511003 Recirculating Catch Can | eBay

The catch can is semi translucent, you can see into it (especially with the green antifreeze), it is piped to the vertical tank which is catch only now. If you look at my drawing you'll see I...

My recovery tank did not match the radiator's expansion and was sucking air back, now it balances perfectly, no air.

Here's an update on how the new expanded recovery system is working,

Went out today (100° +), one of of my cooling fans went down and the motor heated up, recovery system held everything and...

LOL!!!
Good one!

One SPDT relay can do it all. Switches are easy. The ideas are fun!

No problem, be glad to update.

Now to my next OCD project, a circuit to remind me to turn off my headlights and release my parking brake.............

LOL! I see the confusion now.

I have a 36, the grill goes below the radiator, the catch can is visible to me through the lower part of my grill (most won’t see it is there). The catch can runs at...

34-40, thanks for the kind words.

Roger, no disrespect intended and I’m not doubting your method, I’ve used that same method for years.

Unfortunately, this time it simply was not working for...

Absolutely correct, unless your way cool chrome hot rod recovery tank is too small as mine was.

Not trying to tell anyone what to do, just sharing what I did to correct my problem in hopes it...

You only need a recovery tank if you’re using a sealed system, most of the older cars like yours were an open system (purged to the ground). In a sealed system the radiator purges to the tank then...

The small recovery tank (tube type along side my radiator) did not have enough capacity to maintain a proper level in the radiator. On hot days (100° +) the radiator would purge more than the tank...

I recently discovered that my shinny cool radiator recovery tank could not maintain a full level capacity in my radiator on the hot California days, if the radiator was full the tank would spill over...