Sounds like the head gasket (then again idk too much about engines...but i am on my second HG leak
)
When i was driving home yesterday the needle kept going up....i pulled over...filled up the reservoir and that didn't help AT ALL...tried to go some more but it kept going up...i was only a couple miles from home so iwanted to try and make it but she didn't cooperate so i had to call AAA to tow her back. The first 3 miles are free and luckily i was 3.2 miles from home so he let me off for free. Now she's sitting in the driveway for the rest of the week until i pick up my 3500 on wed. Swap gets done next weekend! woo woo!
200k is a lot of miles though. Start searching for a new engine!