radiator problem on Montero 2002
 

I am driving A montero 2002 v6, two week ago I started to have a problem with the radiator antifreeze, I don't have leak and this don't go to the engine but I have re-fill every two day and now I am having problem with my AC, the systems is blowing cool air and 15 minutes later is blowing hot air.can you give me your advise ? please

sorry for my english but I am speaking russian only.

thanks

sounds like your a/c unit needs a new expansion valve