last year i had similar problems except for the fact that the blower would just shut off by itself, so I replaced the blower, blower relay, and resistor. And i have had zero problems until now. The issue is if i run the fan (A/C too) for a while, I can change all the speed settings fine, BUT if i turn it off I cannot turn it back on for a couple minutes. And then i can turn it on all the speeds and everything is fine again, unless i choose to turn it off, then it stays off. Relay again? Im lost here.