the appliance you have may have a heating element where the heat could be blown out externally via a fan blower, now if the heater element has gone hence the heater blowing cold.
(that's my logical way of thinking anyway) on the little info given in question
wirecutterman
January 2010
It's all relative - heat is one thing and temperature something entirely different...
Heat may be defined as energy in transit from a high-temperature object to a lower-temperature object.
Temperature is just a step along the way...
Peccavi
January 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.