Im pretty sure i have a 84 d50 in my 1987 mazda p/u. Im not getting heat to the heater core and not sure where to start. Im planning on running water through the heater core ports tomorrow to see if the core itself is plugged but im not sure if the guy who did it even hooked it up correctly. another question i have regards the thermostat, Ive replaced it twice thinking it was bad but the motor isnt coming up to temperature. I know i need to replace the radiator because it is tweeked so that could be part of my problem but its bubbling back up when filled all the way and comes to running temp. one more thing is im not getting the power i would expect from my motor. its a fairly fresh rebuild with a redline webber. im not sure if this guys swap skills are to par but i have a lot of questions and i would appreciate all the help i could get. ill post pictures on my profile if that will help. this truck still runs paid 700$ for it and i love it. thanks guys