I get a steady moaning/groaning noise from my vents.....someone told me that the baffle doors are always moving? Whats going ON???????

take it to a panel repair shop and have the body checked around the tow bar area and rear end suspension points for loose spot welds, cracked body floor panels, loose towbar bolts etc
to get any noise there has to be something moving, stretching or cracking so a very close inspection should be made

Power steering pump, air in p/s fluid or low fluid level, faulty rack and pinion unit or failing CV joint bearings are some things to look into. You didn't mention conditions when noise occurs. Good luck.

Groaning in the column itself could be the column bearings, or perhaps the horn contacts, although they make more of a scraping sound. A little lube sprayed between the steering wheel and column may help that. If you're referring to noise in the steering itself, sometimes the front upper control arm bushings groan when they're worn out. Or power steering fluid loss due to leakage from rotted power steering lines under the van. Trying to address all that I can think of, but your question is rather vague.

Hello! This is a known problem that is addressed by the following Technical Service Bulletin...Guru...saailer

Subject:Steering System Moan, Groan, Shudder and/or Vibration Type Noise During Low Speed Turning Maneuvers (Replace Steering Gear) #04-02-32-007A - (12/01/2004) Models:2004-2005 Buick Rainier
2003-2005 Chevrolet TrailBlazer, TrailBlazer EXT
2003-2005 GMC Envoy, Envoy XL
2004-2005 GMC Envoy XUV
2003-2004 Oldsmobile Bravada
Short Wheelbase Utilities Built Prior to VIN Breakpoint 52123375
Long Wheelbase Utilities Built Prior to VIN Breakpoint 56137280
This bulletin is being revised to remove the 2002 model year and add the long wheelbase utilities. Please discard Corporate Bulletin Number 04-02-32-007 (Section 02 -- Steering).

ConditionSome customers may comment on a moan, groan, shudder and/or vibration noise while making low speed turning maneuvers. Customers usually notice this condition in parking lot turning maneuvers.
Correction

1. Diagnose the power steering concern. Refer to Symptoms - Power Steering System (SI Document ID #670351).
2. Replace the steering gear with a newly designed steering gear. See the parts information below. Refer to Power Steering Gear Replacement (SI Document ID #742314).

Parts Information

Part Number

Description

Qty
88965356
Gear Kit, Steering
(Short Wheelbase Utilities)
1
88967181
Gear Kit, Steering
(Long Wheelbase Utilities)
1
Warranty InformationFor vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time
E9740
Gear Assembly, Power Steering - Replace
Use published labor operation time
E2000
Toe, Front - Adjust

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

If it seems to get louder when you turn the steering wheel then check your power steering fluid level. If determined this is the cause of groaning sound but fluid level is right then you will need to bleed the air or the pump is going bad. Beyond that I need more info for further help.

Depending on what year the vehicle is, the resevoir/pump should be located on the driver's side (left) and in the very front. If it is already moaning, you might be looking to replace the pump as with no lubrication it will wear down the bearing and the veins in which pump the fluid to create hydraulic pressure. You may add automatic trans fluis (Dexron/Mercon) which will work great (unless otherwise stated on the lid). Find out where the fluid is going so you don't do further damage and possibly end up in an unsafe situation. Let me know if you need further help. Love Mercedes!!

My esp light, all wheel drive light, traction light and abs lights have come on & won't go off. Tried everything I could think of. Tires are new, brakes are a little over 2 years old. Recently tires rotated. Maintenance done regularly . Whats wrong?

Have you checked the power steering fluid level? This is a sign of possible the power steering fluid below or empty

Doesit moan all the time it's on or just as it starts. If it continues to moan then an orfice tube may be partly clogged. If just as it starts and goes away it's just the freon getting moving in an old car. the compressor has lots of miles and the seals are leaking interanlly in the compressor you say it's still cooling but if this is the case it won't for long. Sometimes the air motors in the dash move to the AC mode and they make noise as they move but should stop makings noise soon after startup

check your brakes on that wheel. The caliper may not be releasing