The pump may not be working as and is now under stress caused sometimes by the power steering pipes braking down on the inside of the pipe. You will have to replace the pump and check the pipes from the power steering pump.
Hi verlin
the problem that you have is the power steering fluid, the pump pressure goes down as the fluid gets hot this will cause the steering to get tough, I advise you to change the power steering fluid, make sure not to use ATF type, the recommended fluid type for your Volvo is PENTOSIN CHF11S. check your owner manual.
Good Luck
You should investigate the rack and pinion. If you know that your pump is working there is a very, very good chance your rack and pinion are faulty.
SOURCE: 2005 GMC ENVOY 4.2L VIBRATION PROBLEM AT IDLE AND START UP OR ANY TIME NO ACCELERATING
Hello! This is a known problem that is addressed by the following Technical Service Bulletin...Guru...saailer Part Number Description Qty Labor Operation Description Labor Time
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
Parts Information
88965356
Gear Kit, Steering
(Short Wheelbase Utilities)
1
88967181
Gear Kit, Steering
(Long Wheelbase Utilities)
1
Warranty InformationFor vehicles repaired under warranty, use:
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
SOURCE: Remove the steering wheel or airbag from a 2004 Volvo XC90?
You need a steering wheel puller. You may be able to rent this from your parts house. Disconnect the battery for no less than 1/2 hour before disconnecting the air bag or the air bag could deploy. Place air bag facing up or it could become a projectile if set off.
SOURCE: 2004 volvo xc90 rough idle at stop
If the idle problem occurred after replacing the plugs, double check your work. Make sure you installed the coils correctly and that you didn't pinch the coil wiring under the top engine cover. I would also be wary of anything other than the OEM plugs. I've seen too many issues from using aftermarket plugs on these engines.
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