strong air flow but NO HEAT in cabin

next to an official service manual from mazda, I favor the Haynes manuals available at Napa auto parts. Very well written, and pretty thorough.

If you are getting heat from both heater core hoses then hot water is going thru the core. So I would suspect the blend door, or the cables, or vacuum lines that lead to the door. Check these first. You will have to do a contorsionist act under the dash most likely. Good luck.

Thank you so much Skipatrol. I will try these tasks. All other suggestions are also welcome and appreciated.

You're welcome, I hope it works.

Update! My partial and temporary solution. It appears an actuator is missing that controls the heat/cold positioning. I didn't know, I bought the car in this way and it was summer so I didn't check for heat. anyway ( not a big fan of AC even in Tx.. although some summer days appear unbearable.. long story short.. I fixed it into position with a zip tie so I have really good heat now... I can remove the zip tie this season, as summer approaches so I am seeking another solution..but that actuator is quite costly. Guess I'll figure something out in this case. Hope this helps some others.