Ive read and read about vacuum leaks causing the ac to flip from blowing thru vents to defrost but this is not my problem. My ac blows thru the vents just fine but when u accelerate to get on highway u can hear it flip to heat thru the vents . Can someone tell me if there is a certain vaccum line or motor that coukd cause this. Im at a lost with jt its an 04 ford expedition
Ac up front flips to heat under heavy acceleration
- Thread starter keithnra
- Start date
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ExplorerTom
Full Access Members
Sounds like a blend door issue. Look into that.
On first gens (not sure if it's the same on 2nd gens) you can cut a hole in the airbox behind the glove box to see if the blend door is working. If you have to replace it, you have to cut open the airbox anyway (or remove the entire dash).
On first gens (not sure if it's the same on 2nd gens) you can cut a hole in the airbox behind the glove box to see if the blend door is working. If you have to replace it, you have to cut open the airbox anyway (or remove the entire dash).
