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AC/Heater blower motor fan

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1999 996 C4

It seems my AC/Heater fan blower is not blowing as strong as it did in the past. Very little air comes out of the vent until I increase the speed about half way and even at max, it is definately not as strong. Otherwise, air conditioner and heater are working fine. Any suggestions?


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Check the ballast resistor first - save some time.


1. Remove footwell bulkhead and right air guide. Pull off electrical plug connection on the blower motor and remove wire from the holder.


2. Pull off electrical plug connection on the ballast resistor and undo both fastening screws on the housing lid. The ballast resistor and housing lid are a spare part.


Note: When the housing lid is removed, the blower motor is simultaneously detached from its guide. Hold the blower motor and carefully remove it in downward direction.



1. Install blower motor and fasten housing lid.

2. Tighten fastening screws carefully (plastic housing).

3. Engage electrical plug connections and perform a function test.

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