Dash A/C COMPRESSOR BLOWING FUSE

[hbr509]

I need some help 2007 Dynasty a/c compressor keeps blowing 5 amp fuse , I replaced the relay still wont work , I put in another fuse and it may last an hour and sometimes 10 minutes .  Any ideas  . I also had a ac guy hook up power probe to the wire to compressor and it was 12 volts .and let the engine run and 1 time it spiked to 18 volts for a second then went back to 12 volts  . Thats when I changed the relay .

Edited May 15, 2022 by hbr509

[Jim Byrd]

You need to put an amp meter in the circuit to determine how much current the clutch coil is drawing. The maybe a partial short in coil.

[welleking]

sounds like you are using the wrong size fuse. the 18 v is the cycling of the coil and is expected... the coil should be a 15 or 20 amp fuse and the relay coil would be 5 amps.