Ford mustang- 2004 convertible with condensation coming into interior air vents when running a/c,with the top down and humid outside. New owner- dealer says common in Mustangs !! Anybody else have ???
By manufacturer design the A/C evaporator core located in the plenium chamber does not allow enough air flow to cross and lower the temperature around the core. Thus the case builds up a lot of moisture, which in turn forces moisture vapor to flow into the A/C ducts and into your car. I am not sure about this, but if memory serves me correctly, Ford did at one time have a manufacturer repair process which replaced the original small drain tube with a larger tube that allowed moisture build up to escape.
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Thank you to John Westwood - your response matched other info I had found.
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