hi,I have a crv 2006 the heater blows cold air only ive flushed the rad and the heater matrix and its just about warm as any one had this problem.thanks tony

That sounds very interesting, have you taken it to a garage to get it checked? 

the Matrix will have to pipes inlet/outlet if you can feel the inlet when engine is hot then the outlet and they are not both the same temperature the Matrix is blocked and needs to be replaced or cleaned out as the pipes in the core block up and restrict the flow