Cold air return is blowing air out not taking air in. No flow
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It just started doing this and had been working properly? You need to have a professional take a look at your system.
Hi Charles,
I would call in a heating professional. We switched our hot & cold air returns in one room and they were totally connected in a different way. I'm thinking that it might be because of a hole or disconnection in your duct work. At least, that's where I'd start. Wishing you the best.
An HVAC specialist, they know many systems or consider bringing in the company that installed your system.