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Hello, if you try and spin the driveshaft by hand does it spin?
Is the vehicle running when you do this? If the vehicle isn't running the front hubs will automatically engage and spin the driveshaft.
When the vehicle is running with the front tires on the air. Does each front wheel spin freely?
If each wheel is spinning freely with the vehicle running, but turning the driveshaft also turns the tires?
The half shafts should spin with the driveshaft. If the vehicle is running and both front wheels are disengaged from the half shaft while spinning. There is no way for the driveshaft to turn the wheels. This is how the system is designed. So if the engine is running and the front driveshaft still turns the wheels you have a large vacuum leak.
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with the engine running? If that is the case you are losing vacuum to the wheel ends and they are staying engaged. If you replaced the solenoid and check valve you might have a bad vacuum line or you could have bad wheel ends at the hub?
If you disconnect a vacuum lin at the hub while the vehicle is running do you feel vacuum coming out of the line?
If you arne't feeling any vacuum then that is going to be your issue. you need to find out why the solenoid isn't allowing vacuum to go to the hubs. If you used compressed air the line could have seperated at a splice.
You are losing vacuum at some point. There is nothing else it can be is you have no vacuum to the hubs.
As far as I know it is a one time fee unless you sign up for a subscription. I work independently from my house in my free time to assist people. I don't get paid unless I receive a positive rating from the customer. The question does remain open if you have to go and look at the vehicle for a while though.