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Old 06-02-2011, 11:20 PM   #1
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AC running but no air


We have a two-story house with 2 outdoor AC units and 2 Carrier 58sta/stx furnaces in the unfinished basement. One controls the upstairs, the other downstairs (both are marked). The downstairs AC is working fine.

The outdoor AC unit for the upstairs is running, and the furnace for the upstairs is also running. The upstairs thermostat is set to ON (AC). It's a programmable thermostat, but the current temp is higher than the programmed setting. So we dropped the temp manually and clicked HOLD TEMP. We're used to this thermostat, as we've been using it for the past five years.

The problem is no air comes out of the upstairs vents. Nothing, not cold or hot air. I checked the furnace and the light is solid RED (which I think is normal). Replaced the filter, the old one was a bit dirty even though it was replaced less than a month ago.

Tried turning off the thermostat and the furnace and then flipping everything back on. The AC and furnace start running again, but still no air. We haven't messed with the ducts or the vents.

I hate to call out a tech if it's something simple. Thanks in advance for any ideas. I'm happy to post pics if that helps.

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Old 06-03-2011, 07:24 AM   #2
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AC running but no air


sounds like the blower in the upstairs furnace is not working.... @ the upstairs thermostat turn the fan to ON and verify the upstairs furnace blower is working.

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Old 06-03-2011, 10:22 AM   #3
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AC running but no air


That's exactly what we're having trouble with -- getting any air whatsoever upstairs, even with the thermostat turned to ON.

I assume a repair requires a professional?

EDIT: Something in the furnace is running, sounds just like the downstairs unit -- wouldn't that be the blower?

Last edited by insolitude; 06-03-2011 at 11:16 AM.
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Old 06-03-2011, 03:59 PM   #4
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AC running but no air


possibly.... but if there is no air flow then probably not if your filters and coil are clean.... you can repair it your self, but you need to do some more digging as to if the blower is running or not, or you are just hearing the refrigerant flowing through the coil....... remove the blower door and find out if the blower is running. Or simply call a pro and have it done for you. We cant do it for you over the internet.
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Old 06-03-2011, 09:21 PM   #5
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AC running but no air


Does the suction line feel chilled when you turn it on?
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