HVAC Broken When Property Purchased - not notified

[Josh Kliethermes]

Timeline of events:

- Inspection performed, no AC issues found

- Closed on property

-Days later, tenant informs me central air system hasn't been working for 2+ weeks (after inspection but well prior to closing) and they let the past owner know about this, and the owner didn't do anything. I was not notified of the issue until after closing when the tenant told me. 

Is this something I am on the hook for, or is this on the seller since they knew about the issue prior to closing?