07 XL Denali

[carrmann]

Sounds like your compressor may be shot. It is easy enough to remove and visually inspect. Then, you can provide 12 volts to the compressor with test wires and see if the compressor fires up, or not.

Ok, I'll get on that. Hopefully it just needs the compressor

Is there a way to test the front setup, or do i need to just buy a pair and install to see what happens?

 

[Joseph Garcia]

Ok, I'll get on that. Hopefully it just needs the compressor

Is there a way to test the front setup, or do i need to just buy a pair and install to see what happens?

As indicated earlier in this thread, a quality bi-directional scanner is needed to test the electronics on these shocks.

 

[carrmann]

The tech2 I said I had earlier, that is the correct one to use?

Not sure what I'm checking to check front shock stuff, the connectors are just laying in the engine bay (not connected at all)

 

[carrmann]

Sounds like your compressor may be shot. It is easy enough to remove and visually inspect. Then, you can provide 12 volts to the compressor with test wires and see if the compressor fires up, or not.

removed compressor. its either original or an old OEM. it did not fire up with direct power.

I'm looking to buy a compressor from a local store. I've got Dorman (which I've heard is not good), or Arnott. I have 2 Arnott options P3242 and P2793. Any idea which would be better or if theres a difference? The P2793 is about $100 cheaper.

 

[Joseph Garcia]

removed compressor. its either original or an old OEM. it did not fire up with direct power.

I'm looking to buy a compressor from a local store. I've got Dorman (which I've heard is not good), or Arnott. I have 2 Arnott options P3242 and P2793. Any idea which would be better or if theres a difference? The P2793 is about $100 cheaper.

Go to GMPartsDirect.com, enter your VIN, go to the Suspension section, and find the compressor. That will give you the correct part number at a competitive price. You can use this correct part number there, and cross-reference it against the Arnott part numbers to find the correct replacement, if they are substantially cheaper.

 

[carrmann]

I temporarily connected a brand new compressor to the yukon. the exhaust valve opens/shuts when commanded. the compressor does not do anything. i have 4 suspension faults, all are faults with the front suspension (short to battery(says passed on both) and circuit open (says failed)for both front shocks, which are not connected).

all 4 dampers show as 0% actuator comm in the tech 2 scanner.

I tried with VSES and without as I'm not sure which one to use in suspension chassis menu.

does it matter if the compressor is fully installed on the chassis, air hoses on etc? does it matter if the rear dampers are showing 0% actuator comm? I dont want to install new shocks until I know the compressor is working (I dont want to damage them). anything else I should check??

 

[carrmann]

Anybody?

 

[Doubeleive]

Anybody?

did your air compressor come with a new relay? if not the relay is strapped/or taped to the main wireharness in the engine compartment typically right below the brake fluid resevoir area, kinda can't miss it, big relay. the compressor should come on anytime it is commanded with the tech 2

 

[Joseph Garcia]

You can also take the compressor out and bench test it with 12 volts. It is easy to remove with 3 bolts (or 2).

 

[carrmann]

new compressor didn't come with a relay I don't believe. I will double check when I get a chance (its pouring right now and I'm on my phone at work)

I bench tested both the old and new one. new one comes on with 12v power, old one does not