So ive been losing coolant in my 4th gen and ive noticed that the level in the reservoir is staying constant. I replaced the radiator about a month ago as well as a new cap and system seems to be making pressure. Just makes me wonder why it isnt sucking from the reservoir when it comes back down from pressure.

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'93 Honda Prelude Si
'02 Corvette

You can't have pressure if you have a leak.

Well... something to think about, if you are not losing coolant now (after the cap) but your reservoir still won't fill the rad, it may be a cracked rubber line, and instead of pulling coolant, it's pulling in air. this would also explain if you had pressure in the radiator and a slight leak out of the tubes...

How far up can you see the wet coolant on the rad? If it's all the way up at the top chances are it's the rubber tube or the cap. If it's half way down, probably a hole in one of the cores, or if at the bottom maybe a hose or again, core.

Can you try to pinpoint the leak?

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It's hard to say since i have spilled coolant under hood lately, but i dont have an "active" leak from what i can tell. But the hose is a good idea to try. The level gets below the neck with the reservoir but the reservoir stays the same. Ive also noticed that sometimes when i go out there is a slight vacuum on the system. After it cools of course.

Just went outside and pulled the overflow hose assembly off and plugged one side and blew on the other, didnt hear anything that was leaking. I did notice that im not sure if my cap fully seats, and seems to go on really easy now that im paying attention to it. Almost like the center of it is sort of resting in place in the radiator and not filling the hole.

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'93 Honda Prelude Si
'02 Corvette

Get a pressure tester and test the system and the cap.

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Thats my next step. I also noticed yesterday i didnt have it fully engaged. Makes me think maybe it was enough to hold pressure somewhat/slowly leak/not pull from the reservoir.

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'93 Honda Prelude Si
'02 Corvette