Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

hi there i have i proble with the heaters in y corsa sport (v reg)
first of all the coolent has been bleed up correctly
so wen the engine is at running temp (just under 90degrees) and the heaters are on full it doesnt blow hot air atall untill i rev the engine up but even then there not hot just warm
any ideas