Ok I was checking out the coolant and basicly what happend is the cap broke, the top part comes off and the bottom part stays in the hole, I can take out the bottom part but i have to pry it out. Should i replace it?
 
i did it just comes apart after you take it off again
 
Mine has the same problem....  I actually have to pry the whole cap off.  I'm pretty sure the threads on my actual tank are bad though.  You can definately try a new cap, they're around $5-6.
 
 
Mine does the same thing, but i just do like Shifted said
