Power Steering System Purging
MATERIAL SPECIFICATION
| Item | Specification |
|---|---|
| Motorcraft MERCON Multi-Purpose (ATF) Transmission Fluid XT-2-QDX | MERCON |
NOTE:
If the air is not purged from the power steering system correctly, pump failure could result. This condition can occur on pre-delivery vehicles with evidence of aerated fluid or on vehicles that have had steering component repairs.
A whine heard from the power steering pump may be caused by air in the system. The power steering purging procedure must be performed under the following conditions:
- Prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.
- After replacement of any power steering system component (gear, hose, etc.).
- Remove the cap and install the special tools.
- Start the engine and allow it to idle.
- Using the special tool, apply maximum vacuum for a minimum of three minutes with the engine at idle. Maintain the maximum vacuum with vacuum pump.
- Release the vacuum source and remove vacuum pump.
- Add fluid to power steering fluid reservoir.
- Using the special tool, reinstall the vacuum pump stopper and apply maximum vacuum.
- Cycle the steering wheel from stop-to-stop every 30 seconds for approximately five minutes.
- Stop the engine, release the vacuum source, and remove vacuum pump.
- Add power steering fluid if necessary. Install the power steering fluid reservoir cap.
- Start the engine and cycle the steering wheel from stop-to-stop every 30 seconds for approximately five minutes.
- Check for power steering fluid leaks at all connections. If the power steering fluid still shows signs of aeration, repeat this procedure.
CAUTION:
Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump can occur.
CAUTION:
Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump can occur.