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While these differences aren't extreme, they can affect the performance of the blower motor and the behavior of your HVAC system. Also, each resistor coil corresponds to a different fan speed setting. When the resistance values don't match the expected values, it can lead to inconsistent fan speed operation. This is why your blower motor isn't coming on at higher speeds (2, 3, and 4) until you turn the car off and on again. I think when it comes to the "click, whirr on, then stop" sound you hear when you turn the car on suggests that the blower motor might be receiving power but then encountering a problem that shuts it off and it could possibly be the resistor values. Replacing the blower motor resistor with one that matches the specified values in the manual might be a reasonable step to take.
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