Heater wont get hot tempter is fine fan works ok

Could be heater flap jammed .

This explains possible causes of flap not working ,

http://www.talkford.com/topic/105658-heater-not-working/

there is a little heat exchanger / radiator that may require flushing out. check the manual for position of this and try it.

the heat exchanger/radiator you are refering to is the heater matrix,check that the pipes going into the matrix are getting hot both sides,this means that coolant is flowing through ok,if one hot and one cold then heater matrix could be at fault,check the servos on the side of heater box,if you look up under the dash on drivers side you will see where the servos fix onto flaps,the servos can wear