Air Conditioning Evaporator Odor

As outdoor temperatures rise, so do the complaints of evaporator musty odor. To help control the amount of bacterial growth within the evaporator case (which causes the odor), perform the following:

^ Check the evaporator drain hose for kinks or clogs which might restrict proper condensation or water drainage. Also, make sure the firewall outlet end of the drain hose is routed away from the catalytic converter.
^ As a suggestion, try using the "Max A/C" or recirculation mode for initial cool down only. Then switch to the "Normal A/C" mode. This allows outside air to enter the evaporator. Changing the mode positions to selections other than "Max A/C" may reduce the conditions in which the bacteria grows.
^ Also, when parking the vehicle, the duct system will remain in the last position programmed by the mode. Using a selection other than "Max A/C" can also help reduce the odor causing environment.
^ For chronic customer complaints, an evaporator cleaning agent such as "BG FRIGIFRESH" can be used.

NOTE:
OUR REPAIR RECORDS INDICATE THAT EVAPORATOR REMOVAL FOR CORE CLEANSING IS NOT NECESSARY. CLEANING THE EVAPORATOR THROUGH THE FRESH AIR DUCT IS JUST AS EFFECTIVE.