no heat

[zipad]

I have a 92 mx3 with no heat. I have replaced the thermostat,heater core,and the radiator. What else should I look at?

[plusinfinit]

OK i am not sure if it is right but give it a try:
locate the hose from the engine to the heater core, trace hose to the fire wall. There you should see a small plasyic box which has a cable on top. That is the valve that lets the water from the engine in to the heater core. Check out if that valve works.
That is how i did on my 89 corolla. Good luck.