To check for leaks you have to walk around the vehicle and try to spot them..That's one way.
It probably means that there is a leak somewhere in the system. Check the components for leaks.
To fix the air ride on a 1989 Lincoln Mark VII, first, inspect the air suspension system for leaks in the air bags or lines. If leaks are found, replace the damaged components. Next, check the air compressor and relay for proper operation; replace any faulty parts. Finally, ensure the system is filled with air and calibrated correctly to restore proper ride height and functionality.
You have to complete all the check boxes for top ride, air ride and city trial
Run the fan and check all accessable ductwork,especially joints.
You have the air lines, which can get leaks and holes. Also, the dryers and compressors can give out if the system has leaks. Also, the air bags, solenoids, relays, all of these components make up the air suspension in a vehicle. Although people love the smooth ride an air system provides, once these fail it's no longer a smooth ride but a big headache. Suspension solution..... conversion kit. These take the air components out but don't compromise the air ride feel.
To check air ducts for leaks, you can perform a visual inspection for any visible gaps or holes in the ductwork. You can also use a smoke pencil or a thermal imaging camera to detect air leaks. Another method is to pressurize the duct system and use a pressure gauge to measure any drop in pressure, which can indicate leaks.
check your ride height sensors for the car you should have 3 of them 2 in front 1 in the rear
Take it to a dealer and ask them to check for vacuum leaks.
check the air conditioner hose.
check the air compressor first to see if its working, if its working then check the air lines that connect to the air struts, if those are good, that check the air strut its self to make sure there are no leaks even if you have to spray water or something to see the leaks, if any. it has to be one of the three.
Check your cabin air filter.
Check for leaks on the air lines. Or holes in air bags