Diagnosing climate control faults (through 1993):
that should tell you what'* causing the blinking ECC, but it'* very likely to be the airmix actuator. Do a search on airmix actuator and you'll find tons of information, but ONLY if that'* the code you retrieve.
On your codes from the PCM, you're doing something wrong. Those codes are wacky, and all of them should be 2-digit only.
Ignore code 58 if you get it. It'* a known bug in the 1992 PCM.