This is a little tricky?? The fan blows air and heater works but A/C is warm and a noise/rattle with either.
The common denominator would be a temperature blend diverter door. Fan alone can make noise but should not be the cause of poor A/C performance while it still blows the air.
That or the blower motor is bad and you need A/C work. If blower is easy to get out, taking it out and run it may help with the diagnosis,
T
Tom Greenleaf - MetroWest Boston - USA
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