Remove header tank cap and dump the air by pressing the brake pedal a few times. As the compressor fires in watch for air bubbles from the header tank. If bubbles appear when the compressor is under load you have a cracked compressor head.
Remove header tank cap and dump the air by pressing the brake pedal a few times. As the compressor fires in watch for air bubbles from the header tank. If bubbles appear when the compressor is under load you have a cracked compressor head.