Thise plugs are a pain to get out!!! I was able to get a socket on them, but I could not get them out (WUSS??!!) I think an air ratchet would've helped cuz they were on there pretty good...Anyways, since I was unable to remove plugs, I just drained radiator and replaced the coolant in the radiator...I assume I didn't get the proper mix (I went 50-50).