no hot air??

hello there people,i have a mk1 clio 94 and i cant get hot air out the vents.all the water pipes get hot when the car is running,it never over heats and the matrix gets hot it just doesnt blow an hot air out the vents,just cold? any ideas????:confused:

hello there people,i have a mk1 clio 94 and i cant get hot air out the vents.all the water pipes get hot when the car is running,it never over heats and the matrix gets hot it just doesnt blow an hot air out the vents,just cold? any ideas????:confused: i also have this problem with a mk1 94
do u have any ideas on it

you need to flush heater radiator. or change it.