Hi all. Just had my AC serviced and worked great for a few days. Now only the high speed fan works, but still blowing nice cold air.
I replaced the resister with a brand-new one but still no luck (http://prntscr.com/fv6vle).

I fiddled with the switch inside and it came on for a bit!
Any ideas would be most appreciated !

Stephen

 

If you replaced the resistor and still only have high fan then either you have a bad connection, bad wiring between the switch and the resistor, or your fan switch is bad.

 

What year & model do you have?

 

Or the low speed terminal in the high speed relay is bad.

Rather than replacing parts, try tracing wires with a test light or VOM to see where you aren't getting power.

 

Hello. I guess I should have gave the vehicle details LOL!
Model: Delta 88
Make: Oldsmobile
Model year: 1984

 

It what is the fan relay!