The AC works when a new fuse is in but then somehow the fuse blows and all the fan will blow is hot air. Put in a new fuse and it's cold air again.
So what does the fuse that blows, protect?
You need a wiring diagram & start to test
the components most likely to cause a high
current draw & blown fuse.
Don't keep replacing it.
You know the fan control circuit works, but the
compressor doesn't stay on. Did you monitor
the compressor as the fuse blew?
May have a module for compressor & fan
If so one side failed
The compressor clutch could be bad
SOURCE: 98 Olds LLC - AC works but fan air does not blow
If you have a late model GM car and the system is controlled electronically the blend door actuator becomes weak. When this situation occurs it will not move the air direction door inside of the heater/air conditioner plenum. in your case not to the vents Replace the actuator with new and recheck the system. i hope this helps
SOURCE: on my 1998 olds 88
the heater fan is what blows for a/c also. it may need a new resister for fan motor. the resisters should be under hood by the fan motor. just to the left of motor, one is for low speed and one is foor high speed. this is for a 98 olds 88. the resisters govern the speed of the fan, at differant settings. good-day!
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