Why isn't my heater on my 98 honda civic lx working?

Well i have a 98 honda civic lx that the heter is not working on. The car was sitting on my driveway the whole winter of last year until i finished rebuilding the engine. Everything on the car is new. I replaced the stock radiator and fan, it has a new water pump and aftermarket hose for the antifreeze and heater and also a brand new thermostat but some how it isn't working. It blows hot air yes but not all the time and when it does its not even hot hot. Its warm. I have made sure that everything works how it should and it does which is why i'm on here asking for help… Thanks for thoes who do help me and take the time to reply.

There's a heater valve for $20

Put your hand/ fingers over the inlet and outlet hoses to the heater core. Does both feel hot to the touch? If not, check the cable control to the heater valve. The mode door control actuator may have failed.
Edit: This wiring diagram may help if you run into electrical problem:Why isn t my heater on my 98 honda civic lx working - 1

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