GOT A TOYOTA COROLLA VVTLI TSPORT I CNT GET GOOD WARM AIR on 2002 Toyota Corolla

CHECKED ALL MY WATER PIPES THEY R ALL WARM BUT ONE OF THEM GOING TO THE THE MATRIX IS NOT WARM AND SOMETIMES I CAN HEAR THE MATRIX FILLING WATER UP .

Asked by for the 2002 Toyota Corolla
3 answers
Disconnect pipes from Matrix and re-connect to Corrolla...re-check coolant level, heater control valve/blend door issue.
ck coolant level when car is cold
chk yr wtr lvl whn cld , also chk if htr vlv wrks