Purging The Steering System
CAUTION:
If the air is not purged from the power steering system correctly, premature power steering pump failure could result. This condition can occur on pre-delivery vehicles with evidence of aerated fluid on vehicles that have had steering component repairs.
NOTE:
A whine heard from the power steering pump may be caused by air in the system. The power steering purge procedure must be performed prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.
- Remove the reservoir cap and check the fluid. Use Motorcraft MERCON® Multi-Purpose ATF XT-2-QDX or MERCON® equivalent. See Figure.
- Tightly insert the stopper of the vacuum pump into the reservoir. See Fig 1.
- Start the vehicle.
- Apply maximum vacuum and maintain it for a minimum of three minutes with the engine speed set at idle. See Fig 2.
- Release the vacuum and remove the vacuum pump.
- Fill the reservoir. Be sure not to over fill. Use Motorcraft MERCON® Multi-Purpose ATF XT-2-QDX or MERCON® equivalent. See Figure.
- Install the vacuum pump. Apply and maintain maximum vacuum. See Fig 2.
- Cycle the steering wheel fully to the left and right every 30 seconds for approximately five minutes.
- Stop the engine, release the vacuum, and remove the vacuum pump.
- Install the reservoir cap. See Figure.
- Check for fluid leaks at all of the connections. If the power steering fluid shows signs of air, 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 could occur.