Heater/AC works sometimes and sometimes not. No real pattern on when it will or won't. Sometimes the Cruise light comes on during the time when doesn't work but not always.
I assume you are talking about whether or not the blower fan is running. I had a similar problem. The likely cause is the resistors that control the motor speed. I took off the resistor pack and because it didn't look like any of the electronics were damaged I replaced the blower motor and that fixed it. One or the other, or both should do it.
Check fuses first.
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