Rep Power: 0

My civic has started to leak coolant whenever I park the car. The car would overheat, I replaced the thermostat and after that topped off the radiator with coolant. I’ve been drove it to school, it ran perfectly. But then when I park I noticed the engine overheating over the span of five minutes. Then I stepped out of the car and see a puddle of coolant from under the car. It seems to be if I fill up the coolant the radiator enough it drives perfect but when I park it, it will overheat as it leaks out. And as it overheats there comes a smoke to the left of the engine and I’m sure it isn’t the engine Please help, thanks in advance

 
Rep Power: 222

probably a blown headgasket pushing the coolant out the reservoir bottle

 
Rep Power: 512

Definitely a loss of coolant issue. Pull your dipstick to see what your oil looks like. Milkshake look to it? Blown head gasket for sure.

Take a flashlight while it's steaming off and see if you can find out where the leakage is coming from. I can almost assure you it's coolant steaming off and not smoke.

 
Rep Power: 0

Little smoke comes from that area
Well I’m not sure it’s that, because it doesn’t have a milk type color. Oil looks fine, could it be anything else??

 
Rep Power: 512

track down the "smoke." Especially if you're losing coolant, it'll most definitely lead to HG failure if it hasn't already. I had the same symptoms. Put it off because I didn't have the time. Soon enough, had a full blown active leakage on the left/aft side of the engine, so much to the point that it was more than just steam leaking out.

If it's coming out the left (driver's) side, you might luck out and it's the water pump and not head gasket. Exploratory surgery might be in order.

 
Rep Power: 222

Smoke or steam?
Wait for it to cool down then get in there with a flashlight and see if you can see anything leaking

 
Rep Power: 210

Did you follow the service manual to bleed air out of coolant?
1) Jack front end of car up so radiator neck is higher than the engine
2) Switch interior climate control to max heat with fan off and recirculate mode.
3) idle engine while ensuring to top off coolant in radiator and reservoir. Bubbles should get smaller as bleed continues. Can opt to rev engine occasionally to 2500 rpm push bubbles out faster.
4) bleed until bubbles are non existent at idle.
5) lower car, allow engine to cool and check reservoir + radiator levels before driving.

Another possibility is the water pump may be failing (but not completely failed). To check start engine from cold with the cap off and allow to reach operating temp. Rev engine while looking into radiator and see if there is a good coolant current/flow. Keep your face away from the radiator as best as possible while checking coolant flow. Use rag to put the rad cap on or wait until engine cools.

Is the radiator fan engaging while engine is at operating temp, idling and car is parked? If the rad fan isn't engaging it could cause an overheating situation. When a car is in motion the air flow will cool the radiator but when not in motion the radiator fan engages to cool the engine.

The radiator cap may be faulty. I wouldn't normally recommend replace a part without testing but rad caps are cheap (less than $20) so may be good to replace it and see if it helps. Buy a Honda genuine cap only..as aftermarket caps don't fit as well.

As others have stated a blown head gasket could be a possibility too. A block test might prove it but a leakdown test definitely will prove it.

 
Rep Power: 119

In that spot, there is a couple of coolant joints that could be “seeping”.

O-rings on the crossover tubes, coolant lines to the heater core and idle air valve, water passage block itself.

Frankly I would just replace all those seals and gaskets and hoses.

Sure you could cold pressure and looks for the leak, but at this age it’s really a maintained step to refresh the coolant system.

 
Rep Power: 512

Just so we're all on the same page. Left side of the engine meaning passenger side or driver's side? Any time I think of left side with regards to a car, I think driver's side. Parts diagrams also do the same

 
Rep Power: 0

Meaning, passenger side, sorry. I included a picture, I’m not sure if it shows or not

 
Rep Power: 512

In that case, water passage gasket may be a likely culprit. Only be able to tell if you try and trace the "white smoke" which I'm still convinced is actually coolant steaming off.

If it ends up being your water passage gasket, it's P/N 19411-PLC-003, maybe run you 10-15 at a dealership. Assuming that's your car in the picture and you have a stock intake, maybe 30-60 minutes of work, depending on how mechanically savvy you are. Did an emergent change of that gasket once on my 2002, took me 15-20 minutes to swap out start to finish, but I'm pretty mechanically inclined and I had an aftermarket intake that took all of 30 seconds to take off. Solved my coolant loss/overheating issues (I never let it get more than 2 tick marks past center on the gauge) until my head gasket went.

edit: with the engine cool, you'd probably be able to find a concentration of evaporated coolant where it's leaking from.