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Doug Johnson

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About Doug Johnson

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  1. My 2008 Mack heater doesn't change setting or temp. The fan works on all 4 speeds and I have a new controller installed, what else can it be?
  2. my 2008 Mack truck the heat controller doesn't change setting floor defrost panel, the temp control doesn't change temp. The fan has all 4 speeds and I have put a new controller on it.
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