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Discussion Starter · #1 ·
This particular phenomenon has been occurring during the last couple of days only and I'm unable to pinpoint what caused it.
2007 Mazda 3s Hatch

When I have the fan on to blow air in the cabin and the A/C button and light is off, when I turn the heat knob towards heat, the A/C light comes on. It doesn't appear that the A/C itself comes on, but I'm still concerned.

2 days ago, I did two things. 1) Jump started a friends smaller RV, 2)Installed new spark plugs

I just now realized that I forgot to disconnect battery before doing plugs.

What can check on to fix this?
What can I do to fix it?
 

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Discussion Starter · #2 ·
Confirmed that the A/C unit comes on when the heat is turned up. I do not have auto climate control in this car.
 

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Discussion Starter · #3 ·
Also it should be known that it does this when running through vent or combo (never done it prior to 2 days ago).
 
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