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CJT

wrote:

The Blower fan on my A/C will not run in cool mode, but if I turn on
the furnace it starts up fine.

So something is broken -- could be the thermostat, could be the relay,
could be the wiring, could be one of the motor windings (furnace blower
is usually a different speed from AC blower). Get in there with a VOM
and diagnose it, or get somebody who knows how.

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