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What you're smelling is probably Anti-Freeze. It sounds like your heater core may be going out or is out. It will have to be changed, but it's not a job for the weak of heart.

If the heater core is leaking you will have a sweet smell in the cab and the dash will feel tacky. Might just need to change the cab air filter.

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Q: What would cause a bad odor from the AC on a 2003 Expedition?
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