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The heat sink (sensor) has gone bad and is telling the fan to keep going. Even without the key on the fan will still go. I had the same problem on my 2004 Grand Prix. A new fan motor and module next to the fan motor fixed the problem. The failure was caused by rain water entering the fan motor compartment. A rubber seal under the plastic cover beneath the passenger side wiper was to blame.

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Q: Why does the 2004 Pontiac Grand Prix GTP blower motor run all the time even with the key out?
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