AC blower fan no working on any speed. Somtimes works on speed 5.

Blower motor resistor bad ! Watch this video , Blower Motor Problems Auto Repair Help

Sounds like high blower relay is bad

The blower motor may be bad, or possibly the fan speed switch. May very well be the circuit breaker for the blower as well. The blower connector may be loose. Let me know what you find.

if fan only has high speeed selection only but no other speeds then its probably the fan voltage resistor witch parts cost is about 80.00. or if you dont have any speeds working at all then check the fuses it might be the fan motor or the control panel on dash

you will find a blower resistor near the blower motor , it goes into tho the housing with a harness of 5 or 6 wires, replace it

replace blower motor resister

evaporator board needs replacing located inside blower area under dash

i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.

Sounds like a blower motor problem. Check for obstructions around the squirrel cage, or a broken cage.

usually a bad blower resistor is at fault...