Hi. I recently replaced my old valve block with a better arnott brand. When i turned on the truck everything seemed good . The compressor turned on but only for about 30-40 seconds. Then i gut a malfunction sign wthi the shape of the truck and an arrow pointing up. Now the bags wont inflate. Any suggestions? It is a 2010 gl450

 

Hi!

Welcome! Thank you for the Introduction.

I’m moving you post to X164 forum for help from fellow owners. Good luck!

Bob

 

I bet you have a leak. The compressor shut off to avoid overheating.

 

Is this a new problem or was there before valve block replacement?
Why did you replace the block? What were the problems before?

if this is something new, plz check airline connections around the valve block.

is compressor old?

 

Since you wrote the original question in November and haven't acknowledged the replies to your post since then, I don't know if you are still looking for an answer. However, I will post a reply in case anyone else has the same problem and needs an answer.

I have had all kinds of problems with my GL's airmatic. I changed all 4 struts to Arnott at the end of 2015, and had no problems until 2018 when a I developed an Airmatic malfunction (truck with the arrow pointing up) while driving on the highway. I understood from doing research that the GL couldn't sense it's position and therefore wouldn't lower itself on the highway, which it normally would. Indy shop apparently changed sensors (although I am not sure that they did) and after that the GL started dropping in the front from time to time. Gradually this kept getting worse to the point where it dropped while I was driving. I took it to another shop and they changed out the valve block. That didn't help. They then wanted to change the sensors. By the way, I should point out that they first sprayed everything down but couldn't find a leak anywhere. So I came on this board and a few people said it had to be the struts. They said to measure if one side was lower than the other, and sure enough there was a difference, be it ever so slight, there was a difference nonetheless. I contacted Arnott who honoured the lifetime warranty and sent me out replacement struts right away. I installed them myself and lo and behold, the GL now stays up in the air and the ride is fantastic once again. I hadn't noticed but the ride had gotten spongy.

Anyway, that doesn't answer your question. However, this might. I also have an S450. Not too many problems with the airmatic in this car until I hit a bump. I hadn't driven the car for a few months and started driving it again when the GL was in the shop a getting the valve block etc. So, as I was driving, I hit a bump, and the front just went down and seemed to rest on the tires. I couldn't drive it, but interestingly, no warning came up, and the compressor refused to kick on. I had it towed to the garage, and braced myself for a $5000 repair bill. Luckily, as soon as the mechanic removed the driver side wheel, we saw that the link arm for the level sensor had broken from the impact of the bump. The mechanic said the link arm probably seized because I hadn't driven it for so long, and then it just broke when I hit the bump. $30 later, with a new link arm installed, the compressor fired right up and the car was level again.

To make a long story short, check your sensor link arm. You will find it attached to the back of the upper control arm. Good Luck!