heat comes out cold?

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