Help! I am new here and are having two issues with my vehicle. Any help would be greatly appreciated.

My car is 2001 EX sedan has about 140k miles.

One problem has been ongoing since march, I went on a roadtrip and at one point i got caught in a blizzard and had to pull over the side of the road. During my car just idling there it started overheating and ever since that day i have to put in coolant/water in m radiator because it runs out every 2 to 3 weeks. Now makes me think it is a leak because i can put in coolant in it and it will drive just fine without overheating until about 2 weeks later. The only problem is i cant find the leak or anything but i can see it dripping on the inside. Could it be something else? i took it in to a shop and they thought it was the thermostat so i got that replaced already.

second problem just started two days ago, when accelerating the car would start to kinda bounce slightly as if it was struggling to go, it would drive fine after about an hour but everytime i drive now it bounces back and forth while accelerating normally, this is what worries me the most

any help would be appreciated, thank you

 

I hope that I am wrong, but if you are unable to find a leak on the outside, it can only mean that it is leaking into your engine and going out your exhaust. Normally this is because the head of your engine has gotten warped when it first overheated and now it is leaking into your engine. But as I said, I hope that I am wrong as this is a costly repair. Maybe others can chime in.

Can you be a bit more descriptive? "Bounce" is not a helpful description for me. If it is what I think it is, it could be that one of your motor mounts is going bad and is causing the engine to tilt which then could cause a bounce I guess.

So would you say that it is not misfiring or hesitating?