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Hi all - I am an antique car newbie and I acquired a 1924 Single Eight 143 Touring in the spring. I've driven it about 15 times, and on two occasions (including today) upon parking it in the garage after a short (10ish minutes about 2.5 miles) trip, it dumped about a quart of coolant from the relief valve near the motometer just after I shut it down. It was hot today (about 95 degrees), but it was a short trip. The temperature gauge was about halfway up, so it shouldn't really be overheating. I'm just not sure if there is too much fluid in there or not enough. Anyone who knows a lot more about these sorts of things know what I should do? Thanks!

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First, great car
Don't know anything about your model car, but when my 36 pretty much did the same thing, turned out to be bad head gasket
Again, pretty car
Good luck with her
W

Sounds like a classic case or over filling the radiator. If you fill them too full, they will puke out the extra when hot. You need some empty space at the top. These are unpressurized radiators.

When you turn off the engine aftet a good run, it heat soaks the coolant and that's when it's most likely to overflow coolant if there isn't a little bit of empty space and the top of the radiator for expansion.

A quart sounds like a lot of coolant too loose. When I got my first 32 the oldest car I ever owned, I had a similar problem but it would spit the water out going down the road.
Turns out filling the radiator to the top when it was cold is too much water when it gets hot and expands. Use less coolant and watch the the temp gage and see if it makes a difference.
If all else is well, that is probably the problem. J.

Another thing to check is the water pump seal. It is possible for old style water pumps to suck air past the seal and aerate the coolant at higher engine speeds. This can happen even if the pump does not leak coolant out. If the pump is in good condition, tightening the packing nut a little will usually fix the issue. When I say a little, I mean 1/4 to 1/2 turn. A dirty radiator or decayed hoses can aggravate the problem. A water pump with worn bearings or a worn or corroded shaft will not maintain a proper seal. Air mixing with the coolant can mimic boiling in bad cases, and a slight air leakage can cause steam pockets while running and "burping" when the engine is shut down after a run.