Having problems with your 1999 Ford Expedition ?
99 Expedition blows cold in front but not in rear cabin. Heater will work in rear, but no A/C. Front A/C and heat is normal.
Somewhere in the cabin there is a panel, behind it there will be a small vacuum valve that opens duct heat/cool for the back. I had it go bad in a windstar and stuck on heat, too lazy to replace so i'd pull panel and manually move it once or twice a year
Repair Help & Product Troubleshooting for 1999 Ford Expedition
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