Ding, ding, ding, ding.
You DON'T have to pull the entire dash to get to that wretched air mix actuator. It'* not the most pleasant of tasks, but you can get to it by removing the heater core cover. I know because I just did it a few weeks ago and I think it required a much smaller bag of cuss words than pulling the dash would.
If your ECC display is flashing, chances are real good it'* the air mix actuator. I read all the codes out of my '93 and it said the HVAC Programmer was toast. It was wrong, but I did get to upgrade my '93 ECC to a later model. But make sure that'* what it is, 'cause changing it probably won't be a lot of fun.
I have been working on step-by-step procedures for doing this (complete with pictures, I might add), but I've been so busy lately I haven't had time to finish it. Maybe I can get to it this week. The redneck fix is a good temporary solution until you can find the time to replace the actuator. I'd block out about 4 hours or so to do it.