AC blower when turned to 1-3 will blow great but on 4 and 5 it blows nothing. on 2004 Isuzu Ascender

All 5 levels worked until a few months ago. 4 went out and 5 worked ,now 4 and 5 don't work....hear electronic hmmming in background.

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1 answer 1 comment
Blower motor regulator
Thank you! I'll check it out