My heater does not blow warm or hot air at all, its cold as ice! BUT when I turn the **** to the cold air it then blows warm air ? My AC compressor has been locked up for a couple years now but the heater has always worked until this winter.

 

Exceedingly common problem.

https://www.rx8club.com/series-i-do-...ontrol-158200/
https://www.rx8club.com/series-i-do-...x-test-191801/

 

^^^^ +1. Happens to the best of us. This will get you fixed up.