HVAC Mode Valve - Chevy Impala SS Forum
 
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post #1 of 1 (permalink) Old 12-03-2016, 03:05 PM Thread Starter
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HVAC Mode Valve

With my Roadmaster at random, the HVAC will blow to the main upper vents, and I cannot select middle, blend, or floor. I have done no diagnostic testing, other that I replaced the HVAC control unit (I had a spare). I am sure this is not a vacuum issue, but an electrical issue! It could be a wire is jacked up, or I need a new "vacuum electric solenoid". I plan on doing diagnostics, ie checking the circuit. I do get the random code 26, but I don't think that is related; maybe another matter. I couldn't find any postings about this.
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