Probably a junk compressor. I recommend OEM parts only or delete the system and use quality Bilstein shocks. Suspension is never a place to go cheap, it’ll ruin the entire driving experience of a vehicle.
i have a 2005 with the Z55 suspension. My shocks were rotten and the air pump was shot.
I wanted to keep the great air ride, and it is not difficult to replace.
I goggled for replacement systems, and found a complete system out of Florida for uNader $700.00 whis is far better than OEM and most auto parts prices.
It took about 4 hours to “Plug and Play” replace. I am very happy 3 years later, with my decision to replace.
I have since installed a Long Block from Rockauto and had the transmission rebuilt, replaced my torn drivers seat and headliner. I have a very dependable like new SUV for a total investment of under $5,000. Paid for.
FAR BETTER THAN A NEW SUV for $70,000.00
Rides great