Fix Whistling Noise Ford Expedition, Lincoln Navigator
Ford is reporting problems with 2005-06 Expedition/Navigator vehicles with dual A/C systems. The Whistling Noise Ford Expedition, Lincoln Navigator problem is reported at a whistling or hooting sound coming from the rear A/C unit. Ford says the problem occurs when the vehicle is driven with the front A/C on and the interior relative cool. The rear A/C is off and the blower motor speed is set to low. It turns out the rear expansion valve is the culprit. The fix is to install a newer design, part #6L1Z-10849-B. This involves disassembling the rear A/C case and evacuating the system. Then the valve can be replaced. Pull a vacuum and install new refrigerant.
© 2012 Rick Muscoplat