Air leak from front air shocks
The air suspension compressor on my 2000 Expedition 4x4 is working fine, but is running too often. The compressor and the rear air springs were both replaced fairly recently.
My reason for suspecting the front air shocks is that with the car running, the front seems to sink down an inch or so over the course of just a couple/few minutes (with the back staying high). This causes the compressor to turn on. It is able to raise the front back up the necessary inch or so, pretty quickly, and then it turns off. But the whole process repeats every frew minutes.
If the leak was just in the air lines, or at the connection to the compressor/dryer, then I might expect the pumping-up process to take too long. But my impression is failure to hold air pressure after it is pumped up would point to the air shock itself, as I think that the valve or solenoid for the front air-shock is built into the unit itself (unlike the rear bags, which have a separate solenoid).
Am I understanding this right? I want to avoid paying for new front air shocks if the problem might be in the lines, etc.
Any advice on this issue is appreciated.