Heater not working... at all.
 

At first it would just take a while to get warm, then it would could in and out. Now I have no heat at all. Was thinking maybe the blend door, or maybe the motor for the heater is out. Any help would be great as I'm freezing my arse off!

yea.. same problem.. I have wonderful Heat one day and now.. it blows only the cold stuff..

this thread here though fixed everything:
DIY: No Heat? Repair the Heater Control

Perfect, thanks.

No Heat
 

Hey, I had the same problem. Just replace your heater control module as suggested in other post. Winguit gives a simple test along with the steps for DIY's. My husband and a friend replaced mine much cheaper than the dealership, I even got to help.

Same problem
 

:banghead: I just got my rx8 from some guy and the heat worked for a little and since i live in fl i never have to use it but its been reallllllly cold the past couple of weeks and the heat doesnt blow heat it blows icecold air almost colder then my ac...any help?!?!?!?

I had the same prob, my knob for hot/cold temp's was messed up i got hot air only if i played with the knob for like 5 minute until it got into the right spot and it would blow hot air.

make sure your coolant is full also i've seen ppl run aroudn with low coolant and then complain with no heat....