Blowing cold air and ac works but no hot air
 

Okay so we're to start . I purchased my Mazda rx 7 a couple months ago I had to do a few things to it not much or anything big . As the car sat for 8 years in my friends garage . I brought it home and wouldn't start I changed spark a plugs air filter and drained old gas and put new in the car I checked the fuel pump before I started it to make sure it wasn't seized up . It runs great now that I have it running . It's and amazing car .. I have driven it a few time and didn't realize that the hot air wasn't working because of the hot weather I was using the ac . Not its cooling off and I went to use the heater and no hot air the blowers working and so is the thermostat. I read maybe flush the heater core . What if it's not the heater core what's next . I replaced the heater core first because it's cheap lol . If anyone can help I would be great fu I'm new to rotary engine and to madras all together
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Failure of the air mix motor and/or logicon is very common. You can search for "resolder logicon" for instructions on how to attempt a repair. Testing the air mix motor is more involved.

If there is no heat at all on the heater core, the coolant valve may have malfunctioned.

Clean car too. Enjoy.

check your heater core