I have an Escalade that smells like a new car until you turn on the air conditioner. Then it smells like cat piss! Could that be what it is and if so, can it be cleaned out of the system somehow?
You probably have a cabin air filter that needs changing. Spray some disinfectant on the new filter before you install it. HTH. -Jim
Is your car still under warranty? If so take it to a dealer and make a stink!
Seriously, fixing a moldy, stinky ventilation system can be very difficult and expensive to do IF you ever get it right.
Did you get an answer on how to replace the filter? I have same issue...bought the filter and now need to know where it is.
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