Hey guys,

I just tested my dual-air compressor AS system by hooking up the 12 volts directly to the plugs themselves.
Both compressors turned on, they made noise and vibrating but it is a lot quieter than the AS unit I took out. Nonetheless, neither compressors are pushing any air out of the outlet valves (the lines coming out of the compressor, not the ones coming out of the dryer).
Does anyone have any ideas what could be the issues with them? Thank you.

 

maybe the piston rings are cracked or worn?

 

I'd also check that the valve plates aren't stuck or clogged. Maybe try cycling them on and off a few times to see if you can jostle anything loose.

 

Are you replacing a unit, if so was it also a dual compressor system and what was the reason for changing?

It's unlikely both compressors failed in the exact same way, unless something got sucked-in to their air intakes and they're blocked.

Compressors tend do not age well, the diecast alloy body gets corroded so the screws become seized and can be difficult to remove.

BTW the compressors draw between 2.5A to 3.25A each at 12V so aprox 6A for both.

Post some pictures of old and new👍