Mercedes-Benz M-Class: Power Steering Cooling Hose Clamp Leak (1998–2004)

What the evidence shows

Mercedes-Benz recalled certain 1998-2004 M-Class vehicles because the hose clamp securing the power steering fluid cooling hose to the power steering fluid cooler may not provide sufficient clamping force. This is documented in NHTSA campaign 08V465000, an official safety recall — not an owner complaint pattern or a manufacturer service bulletin.

What this means

An insufficiently clamped hose can work loose over time and leak power steering fluid, which can lead to reduced power steering assist.

What may be happening mechanically

A hose clamp below the specified clamping force can gradually creep under normal engine vibration and hose pressure until the connection starts to weep or separate.

What owners may notice

• Power steering fluid spots on the ground near the front of the vehicle
• Steering effort increasing noticeably

What to check first

Check under the vehicle for power steering fluid spots and watch for the steering becoming noticeably heavier, and confirm with a dealer whether campaign 08V465000 was completed for the specific VIN.

What this does not prove

A safety recall confirms an identified defect and a required remedy for the specific vehicles covered by NHTSA campaign 08V465000. It does not establish how many vehicles ever actually experienced the described failure, and any symptom listed above can have other causes — a qualified inspection is still the way to confirm the cause on a specific vehicle.

For owners and buyers

If you own or are considering a 1998–2004 Mercedes-Benz M-Class, check the VIN against NHTSA campaign 08V465000 (through the manufacturer or the relevant national recall lookup) to see whether the remedy has already been completed. An open recall is normally repaired by the dealer at no cost to the owner.