The blower on my 2001 SLT blows only hot air, irrespective of the heater setting. Any idea what's wrong?

 

Heatercore is shot most likely or you need to have your AC unit serviced. My guess is the heatercore though.

 

Turn on your A/C , and open the hood and see if the A/C Compressor clutch
is engaging. If it is not , you most likely have low freon in your A/C system.
If its not , check for power at the comperssor connection, to be sure you have
power going to the compressor, and ground.

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