I replaced the radiator, lower hose, thermostat and all hose clamps on my '90 Civic EX about two weeks ago. i replaced it after finding a leak in the old radiator. The car still leaks after all that work. Here's the thing: it only leaks after I shut the car off after it's warmed up to normal operating temperature, and only about half a cup of coolant each time. From where it drips down, it looks like it's coming from the lower hose connection to the radiator. But I've felt around from under the hood and found nothing to signify a leak from there.

Any ideas?

 

Sounds like a "cold leak" where the hose shrinks a little when cold and the clamp isn't quite tight enough. Also check the radiator drain plug and the radiator where the transmission cooler lines attach to it.

 

yeah sounds like its your drain plug did you use your old one?