I am a new owner of a 1992 subaru legacy wagon (140k) with factory pneumatic suspension, recently the "hi height" switch, has been rapidly flashing after roughly 10 minutes of driving. The suspension appears to be operating correctly, isn't bottoming out, isn't sagging, the compressor sounds like it is operating correctly. My question is why is the "hi height" switch flashing and what are some possible solutions before it goes to the dealership.

 

Thanks 

There are sensors that measure the suspension height. Possibly there is a problem with one of the height sensors.

 

Best solution, is to get rid of the air suspension, convert it to standard coil spring struts. Its gonna break, and replacement parts are usually not available.