The main temperature control knob on my lx470 the center console spins loosely when I turn it to adjust the temp. It does work to adjust the temperature but not accurately. Sometimes I have to spin the knob a few times and it'll just adjust by 1 or 2 degrees and other times it'll go to max. Is this a common problem and is there a fix for it or do I have to search around for a salvage to get the entire climate control panel?