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Have dual air, only blowing cold on passenger side

I have dual air and both was blowing cold, until I had a new battery installed, and now the driver side blows warm, even though I lower the temp by pushing the button, still doesn't lower the temp

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The heater blows out cold air on pass. side. Warm air on drivers side


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I had the same problem when i was working on my 1999 Buick Regal and had to disconnect the battery. I didn't reconnect in the same way that I disconnected the battery from the terminal and noticed that the driver side had no heat or air but the passenger side did. I then disconnected the battery again and reconnected it the same way and now have heat and air on both the driver and passenger side. Hope this helps. Good Luck!

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