Okay heres the deal might be long but plz read this I need help. Im leaving on 3 hour trip tomorrow and I called my dad and told him I would be coming. He asked if I ever changed my radiator fluid because when he put it in the shop the said the coolant would become very muddy looking. So I take the radiator cap off and look in and I can see a little bit of brown in the radiator. The overflow is dry so I dumped so brand new antifreeze in it. Antifreeze is radiator fluid isnt it? as stupid as they sounds I might have forgotten anyways i dumped antifreeze in the overflow thing and filled it and had brown dirty fluid in it. So I unattached the hose at the bottom of the radiator it be on left side if you were in front of the car and I let all the nasty crap drain out all the dirty stuff stayed in the overflow thing but a lot of nasty water came out of the raditor. I then took the hose then blast water through it to get all the nasty stuff out. I attached the hose and is secure so no leak. I added new antifreeze already pre mixed to radiator then turned the car on. The temp guage seemed to respond a lot quicker then usual it usually stays cold for awhile then starts to go up. Mine went up pretty quick about the L then cooled down a little. I went driving first but when I kept back and let it idle this happened. it a little past the m now and never was with there with the dirty water which has been in it for a few months. I turned it off in the and will check again in the afternoon. Antifreeze is raditor fluid??