I have a 04 Civic ex with around 104,500 miles.
I got the car in July and in September I overheated it. I had the head gasket replaces, new sparks, thermastat, and I something was done to the cylinder head (I believe it was that). Got the car back about a week later after over heating it and was fixed. I drove it around perfectly for about 15 days- no noise, leaks, just perfect.
And this october while driving around the whole day, I noticed that everytime I turn on the car it would shake( just start weird). The next morning while doing a few things. I tryed to turn the car on and it would not turn on -it would try to catch but it did not. and sometimes even pushing on the excelarator it would not even do anything just quite and the noise of the starter/alternater (I think) trying to turn on the car, but no "chuga chuga" to to turn on while pushing the peddle.
Now the car sometimes doesnt want to turn on I have to push the peddle to turn it on.

I also put in some Block Seal to try and see if there was a crack in the engine block- but that didnt help.

And also what it started doing these past weeks is overheating, the coolent is dissapering, I have to put some on everyday. There is no leak I checked, replaced radiator cap.

SO now I have a car that doesnt want to turn on and is overheating-- any one can help.

 

Sounds like the new HG failed, take it back to the shop and make em fix it for free.