Gl450 bad air valve block. See full list on cararac. . Those are unfortunately a bit much for me. Jan 7, 2024 · Another GL450 owner on MBWorld. 4 days ago · Best Valve Block for Air Suspension: Top Replacement Units for Mercedes and Popular Models Air suspension valve blocks control the distribution of compressed air to ride height sensors and air springs. The rear airbags are pretty easy. Mercedes Mechanic's Assistant: I'm sorry to hear about your airmatic issue. Unfortunately, it's turned out to be a much tougher issue than I expected. I started my 2011 GL450 this AM and was greeted with a really loud hiss from the rear. 2 years ago I spend like 2500 on the air compressor and installation plus the valve block filter included. zhw flraye utzsn ztpee wmx ofns movw naajy urzu nfysr