1994 Chevrolet Blazer Silverado 8 Cyl 5.7L
Compressor runs for two seconds, then turns off for two seconds. Does this over and over again every two seconds.
Because the compressor is only running for two seconds, the air only gets slightly cold. This happens anytime the a/c is turned on. No check engine light or warning light.
Usually, the short cycling is due to low system charge level. It may mean the refrigerant needs recharging.