Overheating

[LuSarsol]

Howsiit everyone pretty new here but umm have just recently got a 94 toyota surf 103 series had it for about a couple weeks and was heading and my heaters all of a sudden went cold then temperature ran hellah hot Amy ideas what could be the cause?
cheers in advance

[NiftyNev]

Did you mean LN130 series? Probably has a cracked cylinder head.