My 95 C280 was bought used from MBZ dealer, and all was fine except this strange smell from the vents. The smell goes away if I have the a/c or the heater on. If I have the climate control on EC for regular ventilation, it starts to smell like ammonia (my wife thinks smells like vinegar). Any ideas? Should I change the dust/pollen filter and/or do the lysol magic from the fresh air intake? Your help would be greatly appreciated.

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Edward Cho
Menlo Park, CA
1983 Porsche 944
1995 C280