on my 91 acura integ every thing works fin excpet my heater what can possibly be wrong what can i do any help thanx

 

new heater core possibly. It's hard to diagnose this stuff over the internet.. you have to test stuff.

 

Im not trying to be mean but is the car warmed up? Is the fan blowing? Have you checked the cable that controls the airflow to the heater core under the dash. (look under the dash while moving the slider for the temp control? Also there is a shutoff valve in the engine compartment that controls the flow of coolant to the heater core inside the car. Check that valve (its near the fire wall attached inline on one of the heater hoses) is open when the heater is on and off when the heater is off. Start there.