So I think I have narrowed down my problem to an external coolant leak on my 5th gen accord. My mechanic flushed/bled/refilled the coolant tank twice and said there were no air bubbles or leaks. However, after I park the car a substance leaks from the upper left part of the car near the tire. I checked the substance and its the same as what is in the coolant tank. Could this still be a bad thermostat issue or is a hose broken or what?

 

i would check your hoses. check the upper and lower radiator hoses for cracks. then i would check around the head gasket. check your thermostat and make sure your radiator isn't cracked.

 

Is it a small leak?. I would check all the small hoses. If it is by the t-stat did he tighten down the purge valve

 

after driving a good 20 miles it leaked about a 7 inch by 4inch puddle of the coolant. i forgot to mention that i just got the car back from the shop due to severe front end collision damage so the radiator was replaced but i dont know about the hoses, and they may have been torn i just dont know how i can tell

 

i'd bet its bad hoses. Check the lower hose around the clamp

 

trust me you can tell if the hose is messed up. i was driving my 87 civic one day and the upper hose just popped, and you could see a 3 inch long rip. so ya just look at them and you'll be able to tell if there bad or not. there really easy to replace also