EATC issues

[BigJuicy02]

99 EB w/EATC. Blower motor changes speed and then returns to normal. I can't find anything in particular causing it. Seems to be completely random. Control head or blower motor resistor? I'm leaning towards the control head.

 

[expydaddy]

I would replace the cheapest part first. I'd start with the resistor first. If that doesn't fix it, then get a scrap control head.

 

[tsgrpr97]

You should be able to pull DTCs from the cc system. Could help pinpoint your problem

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[BigJuicy02]

I already tried the DTC's. Should have put that in my original post. It comes back with no codes.