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heater blower ?

Odd. So blower runs on all speeds on vent and AC, but not on any speed for defrost or heat. You hear blower running in the first cases, but not the second?

Wierd, because blower should not depend on mode. I'm talking blower noise nore than airflow when thinking diagnosis.
 
I'm currently having a similar issue with my 94. Blower motor died yesterday so i replaced it with one from my parts jeep. Now the blower works through all speeds on defrost and all the ac settings, but i have nothing on the heat or vent setting. I'm not sure whats happening? Everything was working fine previously.
 
I would test your switch for HVAC. If the switch is bad it will not detect the need to kick on the fan. I only have test procedures for 97+, but I am sure there are ways to test it... just a thought
 
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