I have a 95 civic coupe & my coolant in the radiator seems to be low every day. The resovoir coolant doesn't seem to be going into the radiator because it stays full. I checked if the hose to from the resovoir is clogged, but its not. Also when the some coolant starts to leak a little bit out of the radiator cap & I changed the cap. It seems to build a little pressure, but it doesn't overheat. I think its either the thermostat or the radiator, but I haven't replace them yet. Any help would be appreciated.Thanks

 

You have a leak, very common on top of stock Honda/Acura rads, clean top of rad off, start engine, let it warm up keeping an eye on the top of rad, [where rad is "clamped" to top cap.

The same thing can happen to the bottom of rad, [bottom cap] although less common. 94

 

Thanks. I will check that.

 

im having sort of the same problem, reservoir is filling up, sometimes overflowing, and then not going back into the radiator when it cools down. i replaced the rad cap hoping it would fix it, but no such luck. could it be anything other than head gasket? no visible leaks or smoking tho..

 

You checked the bottom radiator hose.I had the same problem on my ek.There was a tiny needle size hole.