Blower motor question

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Guys, in my 1969 Riviera (factory AC) the blower motor runs at low speed if I select "Max" on the dashboard. All other speeds (Low, Medium, High) works fine. I've already checked the resistor with an Ohm meter and it seems fine, connectors also good, but I have a feeling that when Max speed is selected the 12V is directly fed to the motor somehow and I think there is something wrong in this. I've already checked the wiring diagram of the car but cannot see any suspicious on it. Could you please advise where and what should I check? 

Edited by Mice007 (see edit history)

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