I have a 2006 Chevy trailblazer 6 cylinder 4.2engine, about 4 days ago, I was driving, it was going normal, I started go over the incline and all of a sudden, I lost power, and basically, I was going crawling up a hill eventually, I got the engine started and got it home, I let it sit for a day...I am ended doing a full tune up, it turns out, number 6 cylinder, doesn't have a spark plug or upside down spark plug but would not come out....with the regular spark plug socket. I did a cleaning on my throttle body valve, so yesterday, I finally decided to drive the car to take my son to school. After about 3 miles, it started to crawl again and then lost power, then it crank right back up while we were rolling but it shut off again, so I coasted to a stopping point and sat there after about 5 minutes, the reservoir started to heat upand saw the bubble, and I relieved the pressure, opening up the radiator cap, I have not been able to get it to restart, when I turn the key, now there's just one, click one, one thud sorta, it doesn't turn it, doesn't turn over, found out the battery was low or dead, so I wont got a brand new battery, does anyone have any ideas of what I need to do to get this car started back up in the morning, please, thank you.

 

Bubbling indicates rising air pressure in the cooling system, which is a sign that the flow of liquid is blocked by a pocket of air. air causes bubbling in the coolant/antifreeze reservoir. This could be due to dirty coolant, low coolant, or bad radiator caps