Toyota Repair: 1987 toyota celica, toyota celica, air doors

Question
my fan blows air but it is cold air.I have no heat. I appreciate your input.  thanks

Answer
Check the heater valve under the hood near the firewall, make sure the cable is connected and it moves when using the control knob other than that itäs possible one of the control cables that directs one of the air doors has become disconnected, look under the left side of the dash and make sure the cables are all attached, there is another one on the right side, the glove box has to be removed to check it, if none of those are the problem then the heater core itself maz be clogged up and needs to be replaced.