2005 Pontiac Grand Prix

You have to install a capacitor at the blower motor control module connector,Some customers may comment on an inoperative or intermittent Heating, Ventilation and Air Conditioning (HVAC) blower motor. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off.

Cause
This condition may be caused by a voltage spike from the wiper motor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent.Install a Capacitor at the Blower Motor Control Module Connector.DO NOT replace the Blower Motor Control Module, Blower Motor or the HVAC Control Head.here is the part number,

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