Hi,

My car is sitting on it´s ass..

- I changed an air bag with leak
- I replaced the air compressor (all cables looking good)

I´m waiting on a new relay. Compressor will NOT run.. but if i run it manually (remove the relay, short the circuit) the compressor runs, but no air at all..

Is it the air block valve? And how can I test this before a buy new?
When I receive the new Relay I will to further troubleshooting with ISTA

 

And how Can i check if the valve is stuck open and just venting all air?